bend the two poles 90° inwards and solder on the BCM circuit

https://imgur.com/OiLXSrL

Hi Ferdi,

I don't understand why you did all that work,

pull the old BCM circuit out of the old battery.

Bend the two poles of the new battery 90° inwards.

spot solder directly on top without drilling anything or adding bits of wire.

Hi Ribson

the best thing to do is bend the two poles of the battery 90° inwards and give them a spot of soldering directly on the plus and minus contacts of the BCM circuit. It is NOT necessary to extract the mainboard as per the guide because you risk damaging the button contacts. Remove the cover, unhook the sensor flat cable, slightly heat the battery, pry it and unhook it from the flat cable. Open the battery film in the BCM circuit part and cut the two poles of the battery so that only the charging circuit remains in your hand

done, thank you all :-)

https://imgur.com/dMgUtPw

https://imgur.com/I6Gpq9L

A small problem (solved) that I encountered with the battery purchased as compatible from ali-express is the greater ( >5mm)

distance (compared to the battery) of the original two poles of the battery.

You have to bend them carefully inwards to be able to weld them afterwards.

https://imgur.com/5mrfzDk

https://imgur.com/v2OCVCc

https://imgur.com/Izw3dU1

https://imgur.com/QsnAN6I

I don't think it's tin welding, but most likely TIG welding.

Difficult to open it, but the less experienced could solder the battery contacts on the top without opening the old solder.

https://imgur.com/zhFXcQ4

https://imgur.com/cKJb137

link: https://ibb.co/f0LGK5L