Tag: aftermarket battery

How iPhone Aftermarket Battery BMS Boards Are Made
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 firmware programming, functional testing, battery cell assembly, and final strict quality inspection.

What Is an iPhone Battery BMS Board?

The BMS board is the control and protection system of a rechargeable battery, helping monitor the battery and protect it during charging and use.

For an aftermarket iPhone battery, 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.

Depending on the design, a battery BMS board can help with functions such as:
- Battery voltage & current monitoring
- Temperature-related protection
- Overcharge & short-circuit protection
- Battery data and state-of-charge estimation
- Communication between the battery and device
This is why two aftermarket batteries using cells with similar specifications can still have different real-world performance and reliability.

Step 1: Bare PCB Preparation and SMT Assembly

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.

Simply put:

SMT stands for Surface Mount Technology. It is a manufacturing method that places tiny electronic components directly onto the surface of a circuit board.

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.

Infrared marking helps identify the positions of the solder pads, while an SPI system checks the printed solder paste to identify issues such as:
- Solder paste offset
- Insufficient solder paste
- Excessive solder paste
- Solder bridging
This inspection is important because inaccurate solder paste printing can affect the quality of component soldering later in the process.

Step 2: High-Speed Component Placement

After solder paste printing, SMT machines precisely place resistors, capacitors, inductors, and other components onto their designated positions on the PCB.

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.

For battery BMS boards, precise component placement is essential because the board contains many small components within a compact design.

Step 3: Installing the TI Battery Management Chip

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 “brain” of the BMS, helping monitor and manage battery performance.

The REWA Selected battery board uses a custom TI chip with an Impedance Track algorithm.

Simply put:

The algorithm helps the battery system estimate the battery’s remaining capacity more accurately by tracking the battery’s electrical characteristics, including impedance.

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’s actual state.

Step 4: Reflow Soldering and AOI Inspection

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.

Afterward, the board undergoes AOI (Automated Optical Inspection) scanning.

Simply put:

AOI uses cameras to inspect the board automatically and compare the soldered components and joints against predefined standards or a golden sample.

If the system identifies an NG (No Good) board, the board is manually reviewed to separate real defects from false positives.

Step 5: Underfill Reinforces BGA Component Connections

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.

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.

Step 6: Firmware Programming and Flex Cable Bonding

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.

How do the controlled heat and pressure achieve?

Through a hot-bar bonding process, the controlled heat and pressure are used to bond the flex cable to the PCB.

After bonding, the flex cable connection is verified through FCT (Functional Circuit Test) to check whether the assembled board actually functions as intended.

Step 7: Battery Cell and BMS Board Assembly

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.

Why Is Weld Quality Important?

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.

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.

Step 8: Final Quality Inspection and Battery Testing

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.

After final inspection, the battery enters a resting period, during which parameters such as voltage and internal resistance are monitored.

Monitoring voltage and internal resistance during the resting period provides additional data for quality control.

Why the BMS Board Matters for Aftermarket iPhone Batteries

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.

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.

For distributors, refurbishing facilities, and repair shops, this means that battery evaluation should go beyond looking at the printed capacity or external appearance.

Frequently Asked Questions

What is the difference between a battery cell and a BMS board?
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.
What is a TI chip in a battery BMS board?
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.
Why are SPI and AOI inspections important?
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.
Why does REWA test battery voltage and internal resistance after assembly?
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.
Why measure internal resistance during final quality inspection?
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.

Conclusion

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.

From a bare PCB to a complete battery pack, every stage can contribute to the consistency and reliability of the finished battery.

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 contact us.
September 24, 2026
Can Aftermarket Battery Finish Parts Pairing on iOS 18?

In this video REWA Lab will share you a full progress about battery test on iOS 18, we will install different batteries to see if they can successfully pair with the device, stay tuned for more REWA professional videos.
For battery repair tools, you can visit website:
https://rewawp.iamtareq.com/repair-tools/
Contact us for more details: +852 5167 5273 / sales@rewa.tech

October 14, 2024

How Should Batteries Be Stored in A Warehouse?

Some repair shops and distributors, due to the lack of professional purchasing guidance, fail to monitor storage temperature and humidity after purchasing batteries and cells in bulk, and also fail to charge the batteries in time. These wrong storage methods may result in battery failure after being stored for more than 3 months, such as poor voltage, battery bulging, etc., which will cause unnecessary losses.

Today, REWA shares battery storage and precautions, along with ways to recharge them, to help you store batteries and cells correctly, thereby save operating costs.

Why Should Batteries Be Stored Properly?

Lithium batteries are commonly used in phones, tablets, and other electronic devices. There are strict requirements for the storage of lithium batteries in terms of temperature and humidity. In terms of battery charging and discharging, temperature has the greatest influence among all environmental factors.

Lithium batteries’ electrochemical reactions are related to ambient temperature. Firstly, if the temperature is too low, the battery will lock and there will be no voltage output. Battery lock means that when battery power drops to an extremely low state, the battery will automatically lock to protect battery health and user safety. Secondly, excessive temperatures will accelerate the battery’s self-discharge rate, which is not conducive to long-term storage.

Additionally, lithium batteries cannot be left in a low-power state for an extended period of time, which will result in a reduction in battery life, and it is irreversible. For this reason, it is necessary to maintain the battery’s performance by checking its voltage every three months as well as performing charge and discharge cycles if necessary.

How to Store Batteries Correctly?

If distributors or repair shops purchase batteries and cells in bulk, we recommend that they build a dedicated warehouse for storing batteries and cells in the following manner:

Classification	Description
Storage Temperation	≤1 month 0～45℃
Storage Temperation	≤3 month 0～30℃
Storage Humidity	65±20% RH
Storage and Transportation	1. The Battery should be stored at a dry moisture, dustproof, shockproof , core packaging.
	2. The Battery shall be stored at a clear ,dry and ventilated room, should avoid contact with corrosive substances, should away form fire and heat.
	3. The Battery should avoid strenuous vibration, impact and pressure in the transport, and need avoiding the strong direct sunlight and under the raining.
	4. The storage time of batteries in normal temperature (20±5℃) environment is 6 months. Batteries must be charged once for more than 6 months. The charging current is recommended to be 0.1C 5A.
Notice	1. The Battery shall be discharged used the specific charger.
	2. Do not immerse the Battery in water or liquid,needing keep off moisture.
	3. Avoid using the battery near a heat source,such as fire and heater.
	4. Do not reverse the polarity of the Battery for any reason
	5. Do not disassemble the Battery. The disassembling may cause a chance to generate internal short circuit in the Battery. Which may cause gassing, firing, explosion or other troubles. And it can lead the electrolyte leakage, which is harmful to health. If the Electrolyte fluid into your eyes or other parts of the body , rinse with water as soon as possible, and quickly sent to hospitals.
	6. Never make short circuit the Battery. It makes generation of very high currents which subsidiary cause heating of the Battery which may cause the electrolyte leakage, gassing or explosion which are very dangerous.
	7. Do not deal with the waste battery by fire, otherwise it may cause the dangerous accident , such as explosion.
	8. If any abnormal features of the Battery are found such as damages in a plastic envelop of the Battery, deformation of the Battery package, smelling of an electrolyte, an electrolyte leakage and others, the Battery shall never be used any more. And The Battery with a smell of the electrolyte or a leakage shall be placed away from fire to avoid firing or explosion.

How to Recharge Batteries and Cells?

To maintain battery performance, REWA recommends testing battery voltage every 3 months. If the voltage is too low, the battery needs recharge.

Recharge Steps:

Use Multimeter to check batteries’ voltage.
Use Battery Charge Activation Board and DC Power Supply to recharge batteries.

Guidelines:

Please store batteries according to the supplier’s product instructions to ensure a safe voltage level. Different batteries may have different standard voltage levels.
When the battery voltage drops below the safe threshold, it is imperative to recharge it promptly and safely.
Note that deeply discharged batteries subjected to high-current charging may overheat, swelling, or damage. Therefore, for safe recharging, it is recommended to combine trickle charging with regular charging.

Please be aware that recharge operations require expertise. If needed, please contact REWA for customized recharge solutions. REWA provides both individual and bulk recharge solutions for batteries and battery cells.

Contact now: +852 5167 5273 /sales@rewa.tech.

how should batteries be stored warehouse battery charging tools

Summary

The batteries and cells used in electronic devices, including mobile phones, tablets, smart watches, etc., are consumables with a limited lifespan. They can usually be charged and discharged 300-500 times. Thus, mastering the optimal storage method is equivalent to extending the battery’s life and ensuring that your investment will yield a greater return.

April 29, 2024

iPhone 12 Pro Battery Replacement: Cost & Shop Guide
iPhone 12 Pro battery replacement is more than a simple cell swap. This model uses an encrypted battery protection board, so aftermarket installs usually need a BMS transfer, data rewrite, and a tag-on flex. Genuine Apple batteries follow a different path with Apple Service Toolkit 2 (AST2).

This guide walks through when to replace, what it typically costs, the shop method vs Apple parts, and how to clear the “Unable to verify this iPhone has a genuine Apple battery” alert. It is written for repair shops and advanced DIY techs who already work with heat, adhesive, and small connectors.

Example device: iPhone 12 Pro
Battery Health: 87% (Settings → Battery → Battery Health → Maximum Capacity)

When to replace an iPhone 12 Pro battery

Apple designs iPhone batteries (14 and earlier, including the 12 Pro) to retain about 80% capacity at 500 complete charge cycles under ideal conditions. Many techs still quote a swap near or below 80%, or when Battery Health shows a Service recommendation. Customers sometimes request a replacement earlier (for example at 85-90%) to restore full-day runtime. That is a preference call, not a hard Apple rule.

In the example above, health sits at 87%. A replacement can still make sense if the customer wants better runtime, or if the phone shows unexpected shutdowns, heat while charging, or peak performance messages.

Cost and battery specs (quick reference)

Prices vary by country, tax, and part grade. Use these U.S.-oriented figures as a planning baseline, then confirm local quotes:
- Apple / AppleCare+ service: about $89 out of warranty for iPhone 12 / 12 Pro battery service (AppleCare+ is often no extra charge when capacity is below 80%). Always re-check Apple’s current estimate tool.
- Independent shop: often about $50-$100+ depending on city, warranty, and whether the shop transfers the BMS or uses AST2.
- DIY / wholesale cell: kits often land around $40-$60 retail; shop wholesale cells can undercut that.
Capacity reference (teardown consensus, not an Apple datasheet line): about 2,815 mAh (~10.78 Wh at 3.83 V). Common part marking refs include A2479 (also seen as styles like 11CP5/45/85 on replacement listings). iPhone 12 and 12 Pro share the same capacity class; 12 Pro Max does not.

How to replace an iPhone 12 Pro battery

1. Battery protection board encryption (aftermarket path)

The iPhone 12 Pro uses an encrypted battery protection board. Dropping in a raw aftermarket cell without handling the board and data is how shops get a permanent Important Battery Message and missing health percentage.

Transfer the protection board: Carefully remove the old pack, separate the original BMS / protection board, and spot-weld that board onto the new cell tabs with a proper fixture. Use a welding machine (or equivalent laser / resistance welder). Align anode and cathode correctly, then insulate with the correct tape and bracket.

2. Rewrite battery data

Models before 2018: A battery programmer rewrite was often enough.

XS and later (including iPhone 12 Pro): After board transfer and data rewrite with a programmer, attach a tag-on flex when you change cell data so authentication does not leave a permanent alert.

Note: Skip these steps and you will usually see “Unable to verify this iPhone has a genuine Apple battery” after power-on.

3. Official Apple battery + AST2

For genuine Apple parts, keep the phone on Wi-Fi and use Apple Service Toolkit 2 (AST2):
Apple Service Toolkit 2 (AST2):

Log in to AST2.

Enter the battery serial number and run diagnostics on the phone.

After diagnostics clear, proceed with the battery install.
4. Remove the old battery
Open the display safely; do not crease flexes.

Disconnect the battery connector, then remove the original pack with adhesive pull tabs or isopropyl. Never lever hard under a swollen cell.

Apply new waterproof frame adhesive. It restores a seal; it does not magically restore factory IP68 rating.
5. Install the new battery
Seat the new iPhone 12 Pro battery (or your shop cell with transferred BMS).

Reconnect the battery connector, reassemble the display, and power on.

Verify charge, Battery Health visibility, and that the phone boots cleanly under load.
6. Clear the genuine battery alert
Initial alert: On first power-up you may see “Unable to verify this iPhone has a genuine Apple battery.”

Genuine Apple path: Log back into AST2 and run diagnostics again to clear the non-original alert.

Aftermarket path: Confirm BMS transfer, programmer write, and tag-on flex were done correctly. Persistent alerts usually mean a skipped auth step.
Watch how to clear Important Battery Message pop-ups on iPhone XS through 12 Pro Max:

iPhone XS-12 Pro Max Important Battery Message pop-ups removing

Frequently Asked Questions

Do iPhone 12 and iPhone 12 Pro use the same battery?
Teardown reporting puts them in the same capacity class (~2,815 mAh). Always match connector, tab layout, and thickness for your fixture. 12 Pro Max is a different pack.
Should I replace at 87% Battery Health?
Apple’s usual guidance centers on ~80% or a Service recommendation. At 87%, replace if runtime no longer meets the customer’s needs or if shutdowns and heat point to a weak cell.
Why does an aftermarket battery show an Important Battery Message?
The 12 Pro pairs battery authentication to the phone. Without a correct BMS transfer, data rewrite, and tag-on when required, iOS flags the pack as non-genuine.
Is AST2 required for every battery job?
No. AST2 is the genuine Apple / authorized-service path. Aftermarket shop jobs use board transfer, programmer, and tag-on instead.
Will new waterproof adhesive restore water resistance?
It restores a seal and is good practice. It does not guarantee factory IP68 performance after a open-repair.
How much does Apple charge for an iPhone 12 Pro battery?
Out-of-warranty battery service is commonly cited around $89 for iPhone 12 / 12 Pro in the U.S. Confirm Apple’s current estimate for your region before quoting.

Wrap-up

A clean iPhone 12 Pro battery replacement means picking the right path: aftermarket (BMS transfer + programmer + tag-on) or genuine Apple (AST2 diagnostics). Keep adhesives fresh, never force a swollen cell, and verify auth and health on first boot so you avoid callbacks.

Need cells, welders, or programmers for the bench? Browse REWA tools, including iPhone battery cell replacements, battery programmers, and spot welding machines.
July 24, 2022
Aftermarket iPhone Battery – Everything You Need to Know!

A battery replacement is one of the most common repairs for an iPhone. There are numerous kinds of iPhone batteries with uneven qualities on the market. If you buy inferior iPhone batteries, there is every likelihood that you will face draining fast, spicy pillow, overheating, etc.

March 23, 2022
How Is A REWA Certified Aftermarket Battery Assembled?

All batteries are consumables. According to Apple, the battery would only last 80% of its original capacity after 500 complete cycles. So you might need to replace your battery and enjoy an optimal play-time.

Thanks to the advanced assembling process, REWA battery has been enjoyed a low RMA rate all the time. The whole process including:

1. Storage warehouse

2. Incoming material inspection

3. Automatic assembling

4. Battery cell preparation

5. Laser welding

6. Insulating tape sticking

7. L-shaped Nickle bending

8. Protection board bending

9. Manual FPC shaping

10. Forming tape sticking

11. Function test

Check our video today for more details.

July 8, 2021
iPhone Aftermarket Screen & Battery Compatibility Test On iOS 13

iOS 13 has been officially released for a month. In order to provide our clients with featuring stable quality, REWA LAB has conducted a series of compatibility tests for iPhone series from iPhone 6s to iPhone X with OEM NEW, A+Grade Aftermarket Screens and Aftermarket Batteries respectively. Now, Let’s take iPhone 6s, iPhone 8P, and iPhone X as examples and show you how the test goes.

Tips: iOS 13 only supports the iPhone 6s and later models.

June 29, 2021
How Is A REWA Certified Aftermarket Battery Assembled?

There are mainly three steps for the manufacturing of a battery. Battery cell packaging, protection board trimming and battery assembling. Today we will introduce the battery assembling process of REWA batteries. With different automation equipment applied during the whole core process, the battery assembling process is highly ensured. The application of industry-leading battery automatic tester also achieves multipoint monitoring from raw materials, manufacturing procedure to the finished product. In this way, defective products can be ruled out in time. Follow us and take a closer look at the battery assembling process now!

1.) Warehousing

One temperature-controlled storage warehouse for battery cells, another one storage warehouse for other materials.

2.) Inspecting

Check parameters of the battery cell, soldering techniques of the PCB and run cosmetic inspection of other materials. Ensure the quality of all materials from the source and complete the first task of incoming material control.

3.) Automatic Assembling

As an important procedure that can directly affect the defective rate and stability. The whole procedure is ensured by automation equipment to lower the defective rate and improve battery stability to the most extent.

A. Battery Cell Preparation

With the help of the multi-functional machine battery cell preparation, lug shaping, OVC test and lug cutting are completed to ensure that the lug of the battery can be shaped perfectly.

B. Laser Welding

Laser welding is the most important procedure during the assembling process. Weld the protection board with laser precisely can definitely avoid unstable battery quality caused by poor welding.

C. Insulating Tape Sticking + L-shaped Nickle Bending + Protection Board Bending

Complete insulating tape sticking, L-shaped Nickle bending and protection board bending with the help of the three-in-one multi-functional machine.

D. Manual FPC Shaping

This step is to stabilize the battery cell and the protection board.

E. Forming Tape Sticking

Complete the forming tape sticking with the specialized machine. Run cosmetic inspection of the semi-finished battery once confirmed, move on to the Logo printing process.

4.) Function Test

Run precise voltage test and internal resistance test on the semi-finished battery. Therefore the functional stability of the battery can be ensured.

5.) Function Test & Cosmetic Inspection

Run function test and cosmetic inspection before shipment. Every single battery you received is qualified and certified.

Conclusion

Thanks to the superior battery cell packaging and protection board trimming of the upstream factory and precise automation equipment support of the battery assembling factory, REWA battery has enjoyed a low RMA rate all the time. Cooperating with the strict quality control process, REWA battery has been quality&stability guaranteed to bring you worry-free user experience that shall be your best choice!

REWA certified Replacement Battery for iPhone/iPad/Samsung/Huawei: http://bit.ly/2MpJHwk

July 30, 2019
Inside the Battery Manufacturing Process:

In our previous articles, REWA explained what should a qualified battery actually be and how we inspect batteries.

Now we will lead you deep into the battery manufacture to find out how lithium polymer batteries are made and what should qualified batteries go through before being safely delivered.

Battery Producing Process

There are four major steps: incoming inspection, battery assembling, battery performance testing and labeling/printing.

1. Incoming inspection includes cell inspection, protection board inspection and battery grading. All material used for the battery must pass strict inspection before assembling.

2.There are 6 steps in battery assembling process: protection board trimming, anode and cathode tab cutting, anode and cathode spot welding, insulating tape sticking, protection board bracket installation and bracket fixing.

3.Battery performance testing is a simple but significant process.

All batteries are double checked to ensure it is sufficient capacity and safety.

4. Labeling and printing, is the last step for the battery producing process. Information about the battery can be labeled or printed to the battery by a special machine.

One of REWA’s advantages for batteries is that we offer customized labeling and printing for our customers’ needs.

Packaging

Battery contains high levels of electric energy.

If improperly packaged in transit, it may short-circuit, overheat and catch fire.

To ensure batteries are safely delivered to our customers, batteries from REWA are packed in a blister box to protect them from any damages during the transportation.

The blister box was designed for easy storage and unboxing, it is utility and will help saving your time.

Customized Service

REWA offer customized labeling and printing service for our customer.

Whether a logo you want to display, a warning note, or a description, you can make the right shape here.

Logistics

We all know that batteries may be fully regulated as hazardous materials for transportation.

REWA here ensures smooth, efficient, reliable and safe logistics channel to bring you the most valuable and reliable logistic service.

To cut down the expenses on transportation, we have exploited logistics service from UPS, DHL, TNT, FedEx and some other special lines.

Certifications

As the lithium battery control becomes more and more strict, many countries have had its relevant certifications.

In addition to CE, FCC, RoHs, MSDS, batteries from REWA also have passed other authoritative certifications like: ICE62133, EMC and UN38.3.

Those certifications not only ensure safe using of the battery, but also are helpful for customs clearance.

At REWA, you’ll find just the right batteries at great prices, which is not only qualified, but also economical yet customizable. So, why not give a shot?

March 22, 2017