need help with wiring PCB

Just bought life-po batterry cells for a dive light and need a little help with the wiring. The PCB has the following markings: P+, P- (I know these are charge / discharge)
B+, B1, B3, B3, B-

It is a 4 cell (12.8v) pack. The PCB is a bcb-lfp12v10A from battery space, the cells are 26660 size 3400mAh 3.2v Life-po cells. Also have matching charger. Thanks in advance!!

I recommend you post some pictures. Get good, focused large pictures of both sides of the PCB.

will do, thanks.

Here are the photos. Thanks!