{"id":42190,"date":"2026-09-24T17:27:42","date_gmt":"2026-09-24T09:27:42","guid":{"rendered":"https:\/\/rewa.tech\/?p=42190"},"modified":"2026-09-24T17:49:41","modified_gmt":"2026-09-24T09:49:41","slug":"how-iphone-aftermarket-battery-bms-boards-are-made","status":"publish","type":"post","link":"https:\/\/rewa.tech\/fr\/how-iphone-aftermarket-battery-bms-boards-are-made\/","title":{"rendered":"How iPhone Aftermarket Battery BMS Boards Are Made"},"content":{"rendered":"<p class=\"wp-block-paragraph\">When choosing an iPhone aftermarket battery, the BMS board (Battery Management System board) plays an important role in battery performance. So, what makes a third-party battery board reliable?<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe title=\"The Hidden Tech Inside Aftermarket iPhone Battery BMS Boards\" width=\"800\" height=\"450\" src=\"https:\/\/www.youtube.com\/embed\/8ywATCZLApE?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">In this article, REWA Lab takes you to explore how an iPhone aftermarket battery BMS board is manufactured, from bare <a href=\"https:\/\/rewa.tech\/fr\/rewa-review-three-pcb-holders-iphone-logic-board-repair\/\" data-type=\"post\" data-id=\"2097\">PCB assembly<\/a> and TI chip placement to firmware programming, functional testing, battery cell assembly, and final strict quality inspection.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/the-crucial-stages-to-make-an-aftermarket-battery-bms-board-1024x576.webp\" alt=\"\" class=\"wp-image-42193\" title=\"\" srcset=\"https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/the-crucial-stages-to-make-an-aftermarket-battery-bms-board-1024x576.webp 1024w, https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/the-crucial-stages-to-make-an-aftermarket-battery-bms-board-300x169.webp 300w, https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/the-crucial-stages-to-make-an-aftermarket-battery-bms-board-768x432.webp 768w, https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/the-crucial-stages-to-make-an-aftermarket-battery-bms-board-1536x864.webp 1536w, https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/the-crucial-stages-to-make-an-aftermarket-battery-bms-board-18x10.webp 18w, https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/the-crucial-stages-to-make-an-aftermarket-battery-bms-board.webp 1920w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">What Is an iPhone Battery BMS Board?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The BMS board is the control and protection system of a rechargeable battery, helping monitor the battery and protect it during charging and use.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For an <a href=\"https:\/\/rewa.tech\/fr\/iphone-aftermarket-screen-battery-compatibility-test\/\" data-type=\"post\" data-id=\"2141\">aftermarket iPhone battery<\/a>, the BMS board works alongside the battery cell. While the cell stores the electrical energy, the BMS board manages and monitors important battery-related functions.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/iPhone-aftermarket-battery-bms-board-1024x576.webp\" alt=\"Close-up view of a populated black iPhone battery BMS circuit board with surface-mounted chips and electronic components\" class=\"wp-image-42194\" title=\"\" srcset=\"https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/iPhone-aftermarket-battery-bms-board-1024x576.webp 1024w, https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/iPhone-aftermarket-battery-bms-board-300x169.webp 300w, https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/iPhone-aftermarket-battery-bms-board-768x432.webp 768w, https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/iPhone-aftermarket-battery-bms-board-1536x864.webp 1536w, https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/iPhone-aftermarket-battery-bms-board-18x10.webp 18w, https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/iPhone-aftermarket-battery-bms-board.webp 1920w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Depending on the design, a battery BMS board can help with functions such as:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Battery voltage &amp; current monitoring<\/li>\n\n\n\n<li>Temperature-related protection<\/li>\n\n\n\n<li>Overcharge &amp; short-circuit protection<\/li>\n\n\n\n<li>Battery data and state-of-charge estimation<\/li>\n\n\n\n<li>Communication between the battery and device<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">This is why two aftermarket batteries using cells with similar specifications can still have different real-world performance and reliability.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Step 1: Bare PCB Preparation and SMT Assembly<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The manufacturing process starts with a bare PCB, which is the foundation of the BMS board. Before production begins, the factory receives bare PCBs that have already passed IQC inspection and loads them onto SMT feeder racks for automated component placement.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>En termes simples :<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">SMT stands for Surface Mount Technology. It is a manufacturing method that places tiny electronic components directly onto the surface of a circuit board.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The basic process begins with solder paste printing. The PCB is positioned against a stencil, and solder paste is applied to precisely defined positions on the board.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/solder-paste-printing-1024x576.webp\" alt=\"Automated SMT squeegee applying gray solder paste over a stencil onto a BMS circuit board\" class=\"wp-image-42195\" title=\"\" srcset=\"https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/solder-paste-printing-1024x576.webp 1024w, https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/solder-paste-printing-300x169.webp 300w, https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/solder-paste-printing-768x432.webp 768w, https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/solder-paste-printing-1536x864.webp 1536w, https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/solder-paste-printing-18x10.webp 18w, https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/solder-paste-printing.webp 1920w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Infrared marking helps identify the positions of the solder pads, while an SPI system checks the printed solder paste to identify issues such as:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Solder paste offset<\/li>\n\n\n\n<li>Insufficient solder paste<\/li>\n\n\n\n<li>Excessive solder paste<\/li>\n\n\n\n<li>Solder bridging<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/SPI-system-check-1024x576.webp\" alt=\"A Sinic-Tek 3D SPI machine monitor displaying a panel inspection layout for solder paste quality control\" class=\"wp-image-42196\" title=\"\" srcset=\"https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/SPI-system-check-1024x576.webp 1024w, https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/SPI-system-check-300x169.webp 300w, https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/SPI-system-check-768x432.webp 768w, https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/SPI-system-check-1536x864.webp 1536w, https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/SPI-system-check-18x10.webp 18w, https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/SPI-system-check.webp 1920w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">This inspection is important because inaccurate solder paste printing can affect the quality of component soldering later in the process.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Step 2: High-Speed Component Placement<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">After solder paste printing, SMT machines precisely place resistors, capacitors, inductors, and other components onto their designated positions on the PCB.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">High-speed nozzles pick up individual components and place them according to the programmed layout of the PCB. Infrared reference marks help the equipment maintain accurate positioning.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/SMT-machine-for-high-speed-component-placement-1024x576.webp\" alt=\"Automated SMT pick-and-place nozzles positioned above a circuit board\" class=\"wp-image-42197\" title=\"\" srcset=\"https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/SMT-machine-for-high-speed-component-placement-1024x576.webp 1024w, https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/SMT-machine-for-high-speed-component-placement-300x169.webp 300w, https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/SMT-machine-for-high-speed-component-placement-768x432.webp 768w, https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/SMT-machine-for-high-speed-component-placement-1536x864.webp 1536w, https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/SMT-machine-for-high-speed-component-placement-18x10.webp 18w, https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/SMT-machine-for-high-speed-component-placement.webp 1920w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">For battery BMS boards, precise component placement is essential because the board contains many small components within a compact design.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Step 3: Installing the TI Battery Management Chip<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">One of the key components on the board is the TI chip. As a key control component of the battery management system, it serves as the \u201cbrain\u201d of the BMS, helping monitor and manage battery performance.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/TI-battery-management-chip-1024x576.webp\" alt=\"Array of BMS circuit boards with a callout label pointing to the installed TI chip\" class=\"wp-image-42198\" title=\"\" srcset=\"https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/TI-battery-management-chip-1024x576.webp 1024w, https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/TI-battery-management-chip-300x169.webp 300w, https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/TI-battery-management-chip-768x432.webp 768w, https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/TI-battery-management-chip-1536x864.webp 1536w, https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/TI-battery-management-chip-18x10.webp 18w, https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/TI-battery-management-chip.webp 1920w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Le <a href=\"https:\/\/shop.rewa.tech\/list\/cell-phone-repair-tools?tagIds=5\" data-type=\"link\" data-id=\"https:\/\/shop.rewa.tech\/list\/cell-phone-repair-tools?tagIds=5\">REWA Batterie s\u00e9lectionn\u00e9e<\/a> board uses a custom TI chip with an Impedance Track algorithm.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>En termes simples :<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The algorithm helps the battery system estimate the battery&#8217;s remaining capacity more accurately by tracking the battery&#8217;s electrical characteristics, including impedance.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Battery impedance changes as the battery operates and ages. Monitoring these characteristics allows the battery management system to make more informed estimates of the battery&#8217;s actual state.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Step 4: Reflow Soldering and AOI Inspection<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Once the components have been placed, the PCB enters the reflow soldering process. The board passes through a controlled thermal profile consisting of preheat, soak, reflow, and cooling stages, permanently connecting the components to the PCB.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Afterward, the board undergoes AOI (Automated Optical Inspection) scanning.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Simply put<\/strong><strong>:<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">AOI uses cameras to inspect the board automatically and compare the soldered components and joints against predefined standards or a golden sample.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/AOI-scanning-every-solder-joint-1024x576.webp\" alt=\"Automated optical inspection machine head scanning circuit boards under bright light on an assembly line\" class=\"wp-image-42199\" title=\"\" srcset=\"https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/AOI-scanning-every-solder-joint-1024x576.webp 1024w, https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/AOI-scanning-every-solder-joint-300x169.webp 300w, https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/AOI-scanning-every-solder-joint-768x432.webp 768w, https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/AOI-scanning-every-solder-joint-1536x864.webp 1536w, https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/AOI-scanning-every-solder-joint-18x10.webp 18w, https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/AOI-scanning-every-solder-joint.webp 1920w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">If the system identifies an NG (No Good) board, the board is manually reviewed to separate real defects from false positives.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Step 5: Underfill Reinforces BGA Component Connections<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">After solder inspection, automated equipment applies underfill along the edges of BGA components before the adhesive is cured in an oven, which helps provide additional mechanical support.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For battery BMS boards, this stage can improve resistance to physical shock and vibration, helping strengthen the connection between the component and PCB during handling and use.<\/p>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-7387b849 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/underfill-dispensing-reinforcing-BGA-component-connections-1024x576.png\" alt=\"dispensing and curing\" class=\"wp-image-42258\" title=\"\" srcset=\"https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/underfill-dispensing-reinforcing-BGA-component-connections-1024x576.png 1024w, https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/underfill-dispensing-reinforcing-BGA-component-connections-300x169.png 300w, https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/underfill-dispensing-reinforcing-BGA-component-connections-768x432.png 768w, https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/underfill-dispensing-reinforcing-BGA-component-connections-1536x864.png 1536w, https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/underfill-dispensing-reinforcing-BGA-component-connections-18x10.png 18w, https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/underfill-dispensing-reinforcing-BGA-component-connections.png 1920w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/curing-the-adhesive-in-an-oven-1024x576.webp\" alt=\"A gloved worker closing the door of an industrial drying oven used to cure underfill adhesive\" class=\"wp-image-42200\" title=\"\" srcset=\"https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/curing-the-adhesive-in-an-oven-1024x576.webp 1024w, https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/curing-the-adhesive-in-an-oven-300x169.webp 300w, https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/curing-the-adhesive-in-an-oven-768x432.webp 768w, https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/curing-the-adhesive-in-an-oven-1536x864.webp 1536w, https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/curing-the-adhesive-in-an-oven-18x10.webp 18w, https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/curing-the-adhesive-in-an-oven.webp 1920w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n<\/div>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Step 6: Firmware Programming and Flex Cable Bonding<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The completed PCB is programmed with firmware before its flex cable is bonded using controlled heat and pressure. To put it simply, firmware is the embedded software that controls how the hardware operates.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">How do the controlled heat and pressure achieve?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Through a hot-bar bonding process, the controlled heat and pressure are used to bond the flex cable to the PCB.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/flex-cable-bonding-by-hot-bar-bonding-process-1024x576.webp\" alt=\"bonding flex cable\" class=\"wp-image-42201\" title=\"\" srcset=\"https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/flex-cable-bonding-by-hot-bar-bonding-process-1024x576.webp 1024w, https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/flex-cable-bonding-by-hot-bar-bonding-process-300x169.webp 300w, https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/flex-cable-bonding-by-hot-bar-bonding-process-768x432.webp 768w, https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/flex-cable-bonding-by-hot-bar-bonding-process-1536x864.webp 1536w, https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/flex-cable-bonding-by-hot-bar-bonding-process-18x10.webp 18w, https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/flex-cable-bonding-by-hot-bar-bonding-process.webp 1920w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">After bonding, the flex cable connection is verified through FCT (Functional Circuit Test) to check whether the assembled board actually functions as intended.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Step 7: Battery Cell and BMS Board Assembly<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">In the assembly stage, the factory first uses capacity-matched cells. The cell tabs are then cut before the cell is connected to the BMS board through fiber laser spot welding.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Why Is Weld Quality Important?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The weld connects the battery cell to the BMS board, so the quality of this connection directly affects the electrical and mechanical integrity of the battery pack.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/battery-cell-and-BMS-board-assembly-by-fiber-laser-spot-welding-1024x576.webp\" alt=\"Automated spot welding equipment connecting a battery cell to a BMS board held in an assembly fixture\" class=\"wp-image-42202\" title=\"\" srcset=\"https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/battery-cell-and-BMS-board-assembly-by-fiber-laser-spot-welding-1024x576.webp 1024w, https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/battery-cell-and-BMS-board-assembly-by-fiber-laser-spot-welding-300x169.webp 300w, https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/battery-cell-and-BMS-board-assembly-by-fiber-laser-spot-welding-768x432.webp 768w, https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/battery-cell-and-BMS-board-assembly-by-fiber-laser-spot-welding-1536x864.webp 1536w, https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/battery-cell-and-BMS-board-assembly-by-fiber-laser-spot-welding-18x10.webp 18w, https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/battery-cell-and-BMS-board-assembly-by-fiber-laser-spot-welding.webp 1920w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">After welding, each weld joint is checked for durability. The battery pack then receives insulation tape and a rubber casing as part of the assembly process, helping provide both electrical insulation and physical protection.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Step 8: Final Quality Inspection and Battery Testing<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Manufacturing does not end when the battery pack is assembled. A strict final quality inspection is performed before the battery is considered ready for shipment.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">After final inspection, the battery enters a resting period, during which parameters such as voltage and internal resistance are monitored.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/final-battery-quality-inspection-1024x576.webp\" alt=\"Technician connecting an assembled iPhone battery to a digital testing device to monitor voltage and internal resistance\" class=\"wp-image-42203\" title=\"\" srcset=\"https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/final-battery-quality-inspection-1024x576.webp 1024w, https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/final-battery-quality-inspection-300x169.webp 300w, https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/final-battery-quality-inspection-768x432.webp 768w, https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/final-battery-quality-inspection-1536x864.webp 1536w, https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/final-battery-quality-inspection-18x10.webp 18w, https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/final-battery-quality-inspection.webp 1920w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Monitoring voltage and internal resistance during the resting period provides additional data for quality control.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Why the BMS Board Matters for Aftermarket iPhone Batteries<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The BMS board is often hidden inside the battery, so it is easy to overlook when comparing aftermarket batteries. However, its design and manufacturing quality can influence important aspects of battery operation.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A reliable third-party battery requires more than simply selecting a battery cell with the right capacity. The cell, BMS board, firmware, electrical connections, protection circuitry, manufacturing process and strict quality test before shipping all work together.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/repart-battery-cell-and-bms-board-1024x576.webp\" alt=\"Hands holding a black iPhone 14 battery cell on the left and a small BMS board with flex cable on the right\" class=\"wp-image-42204\" title=\"\" srcset=\"https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/repart-battery-cell-and-bms-board-1024x576.webp 1024w, https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/repart-battery-cell-and-bms-board-300x169.webp 300w, https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/repart-battery-cell-and-bms-board-768x432.webp 768w, https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/repart-battery-cell-and-bms-board-1536x864.webp 1536w, https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/repart-battery-cell-and-bms-board-18x10.webp 18w, https:\/\/rewa.tech\/wp-content\/uploads\/2026\/09\/repart-battery-cell-and-bms-board.webp 1920w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">For distributors, refurbishing facilities, and repair shops, this means that battery evaluation should go beyond looking at the printed capacity or external appearance.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Questions fr\u00e9quemment pos\u00e9es<\/h2>\n\n\n<div id=\"rank-math-faq\" class=\"rank-math-block\">\n<div class=\"rank-math-list\">\n<div id=\"faq-question-1790132319912\" class=\"rank-math-list-item\">\n<h3 class=\"rank-math-question\">What is the difference between a battery cell and a BMS board?<\/h3>\n<div class=\"rank-math-answer\">\n\n<p>The battery cell is the component that stores electrical energy. The BMS board is the electronic management and protection system that monitors the cell and controls related battery functions.<\/p>\n\n<\/div>\n<\/div>\n<div id=\"faq-question-1790132330563\" class=\"rank-math-list-item\">\n<h3 class=\"rank-math-question\">What is a TI chip in a battery BMS board?<\/h3>\n<div class=\"rank-math-answer\">\n\n<p>TI refers to Texas Instruments, a semiconductor manufacturer whose battery-management ICs are used in various battery applications. In the REWA Selected battery board shown in the video, a custom TI chip with an Impedance Track algorithm is used to support accurate battery monitoring and gauge estimation.<\/p>\n\n<\/div>\n<\/div>\n<div id=\"faq-question-1790132346823\" class=\"rank-math-list-item\">\n<h3 class=\"rank-math-question\">Why are SPI and AOI inspections important?<\/h3>\n<div class=\"rank-math-answer\">\n\n<p>SPI checks the accuracy of solder paste printing before components are soldered, while AOI uses cameras to inspect the assembled PCB and solder joints afterward. These inspections help identify manufacturing issues at different stages of PCB production.<\/p>\n\n<\/div>\n<\/div>\n<div id=\"faq-question-1790132360660\" class=\"rank-math-list-item\">\n<h3 class=\"rank-math-question\">Why does REWA test battery voltage and internal resistance after assembly?<\/h3>\n<div class=\"rank-math-answer\">\n\n<p>Voltage and internal resistance provide important information about the electrical condition of a battery pack. Monitoring these parameters after assembly and during the resting period adds another layer of quality control before the battery is shipped.<\/p>\n\n<\/div>\n<\/div>\n<div id=\"faq-question-1790132369933\" class=\"rank-math-list-item\">\n<h3 class=\"rank-math-question\">Why measure internal resistance during final quality inspection?<\/h3>\n<div class=\"rank-math-answer\">\n\n<p>Internal resistance is one of the important electrical characteristics of a battery. Lower internal resistance generally means less electrical energy is lost inside the battery when current flows, although battery performance cannot be judged by this parameter alone.<\/p>\n\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n\n\n<h2 class=\"wp-block-heading\">Conclusion :<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">An aftermarket iPhone battery is more than a battery cell. Behind the finished product is a BMS board that integrates electronic components, battery-management technology, protection functions, firmware, and flex-cable connections.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">From a bare PCB to a complete battery pack, every stage can contribute to the consistency and reliability of the finished battery.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">By combining rigorous quality control process with technical support, REWA Technology is committed to developing high-standard aftermarket battery solutions for professional repair businesses worldwide. If you have any question, please feel free to <a href=\"https:\/\/rewa.tech\/fr\/commerce-de-gros\/\" data-type=\"page\" data-id=\"9153\">nous contacter<\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>","protected":false},"excerpt":{"rendered":"<p>When choosing an iPhone aftermarket battery, the BMS board (Battery Management System board) plays an important role in battery performance. So, what makes a third-party battery board reliable? In this article, REWA Lab takes you to explore how an iPhone aftermarket battery BMS board is manufactured, from bare PCB assembly and TI chip placement to [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":42205,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"wpai_generated_summary":"The Battery Management System board is a critical component of aftermarket iPhone batteries, controlling monitoring and protection functions. Its manufacturing process involves Surface Mount Technology assembly, precise placement of components including a custom management chip, reflow soldering, and automated optical inspections.\n\nFollowing circuit board assembly, firmware is installed and flex cables are bonded. The finished board is laser-welded to a capacity-matched battery cell. Final quality control includes electrical testing, resting period monitoring, and internal resistance measurements to ensure battery safety and performance.","fifu_image_url":"","fifu_image_alt":"","footnotes":""},"categories":[158,16,5,13],"tags":[530,21,62,153,201],"class_list":["post-42190","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-iphone-guide","category-blog","category-guide","category-how-to","tag-aftermarket-battery","tag-iphone","tag-iphone-battery","tag-phone-repair","tag-soldering"],"_links":{"self":[{"href":"https:\/\/rewa.tech\/fr\/wp-json\/wp\/v2\/posts\/42190","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/rewa.tech\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/rewa.tech\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/rewa.tech\/fr\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/rewa.tech\/fr\/wp-json\/wp\/v2\/comments?post=42190"}],"version-history":[{"count":0,"href":"https:\/\/rewa.tech\/fr\/wp-json\/wp\/v2\/posts\/42190\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/rewa.tech\/fr\/wp-json\/wp\/v2\/media\/42205"}],"wp:attachment":[{"href":"https:\/\/rewa.tech\/fr\/wp-json\/wp\/v2\/media?parent=42190"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/rewa.tech\/fr\/wp-json\/wp\/v2\/categories?post=42190"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/rewa.tech\/fr\/wp-json\/wp\/v2\/tags?post=42190"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}