I have a little bit looked at the shimano protocol and they avec puted a challenge response between the bike and the battery in order to prevent cell replacing. When I'm looking for your picture, I saw a white PCB in order to do not can follow the track of the component on the PCB. By the way there is some glue on the components and connectors, that mean they realy don't whant that you can repair the battery by yourself. I will be interested that you send me others pictures of the PCB, If you can show me the component references ? Maybe if the battery is broken, I'll be interested too by the bottom of the battery PCB

I looked at the Shimano protocol and they put a challenge response between the bike and the battery in order to prevent replacing the cell.

Looking at your picture, I see a white PCB in order to do not can follow the track of the component on the PCB.

By the way there is some glue on the components and connectors, that means they really don't want you to repair the battery yourself.

It would be helpful to see other pictures of the PCB, If you can show me the component references ?

Maybe if the battery is broken, I'd be interested to see the bottom of the battery PCB