iPhone 11 Pro Max Battery Cell Replacement

Escrito Por: Jerry Wheeler

Comentários: 0

iPhone 11 Pro Max Battery Cell Replacement

Dificuldade

Moderate

Passos

Tempo necessário

No estimate

Introdução

To avoid the dreaded Important Battery Message caused by using an aftermarket battery in your iPhone, you can instead transplant the battery's BMS, or Battery Management System, from the original battery to a replacement battery cell; i.e., a battery sold without the BMS attached.

This guide will show you how to disassemble the old battery and install the BMS onto a new battery cell, restoring the full capacity of the battery while avoiding the error message.

Note that the downside to this procedure is that the BMS carries the health information, so even though the battery will effectively be brand new, your phone will still show the original battery health information. On batteries prior to the iPhone 11, you could use a device programmer to reset the health percentage and cycle count, but Apple decided they didn't want people doing that any more, and started encrypting the information such that it can no longer be reprogrammed.

Ferramentas

Peças

iPhone 11 Pro Max Extra Capacity Battery Core with Tag-on Flex

Passo 1

Start out by removing the tape covering the BMS.

Passo 2

Open the flaps on the sides.

Passo 3

Flip the battery over and peel the tape off.

Passo 4

Remove the plastic cover.

Passo 5

Unwrap the BMS.

Passo 6

Unfold the BMS.

Passo 7

Finish removing the tape.

Passo 8

Flip the battery over; you should be able to see the anode and cathode terminal strips of the battery.

Passo 9

Cut the terminal strips to remove the BMS.
Ceramic scissors are preferred here, but normal scissors can be used if you exercise caution. Under no circumstances should you try to sever both terminals with one cut; doing so will short the terminals and could potentially cause the battery to explode. Instead, cut one terminal at a time, from the side, not across the cell.
Please dispose of the old battery safely and in an ecologically friendly manner.

Passo 10

The new battery cell.

Passo 11

After trimming any excess terminals from the BMS contacts, place the BMS on the battery cell.
Fold the terminal strips over onto the contacts on the BMS.

Passo 12

Spot weld the terminals to the BMS.
Trim the excess terminal strips.
Spot welding is by far the preferred method of attaching the terminal strips. However, they can be soldered carefully as long as you minimize the amount of heat transferred from the terminal strips into the battery cell itself.