(C) 2024-2025 ekspla
During a bicycle ride on a chilly winter in Dec. 2023, my XOSS G+ suddenly stopped working. That was caused by the degraded battery (about 4 years & 28000 km of use) and the cold atmosphere at around 0 deg C. I replaced the battery by myself after the ride.
My DIY fix needed tools as followings,
a sharp knife, a pair of tweezers, a fine screw driver and a soldering iron.
The fix was not very difficult, but I had to be very careful in opening the backpanel. This was because the six phillips screws on the backpanel were sealed by glue to make them water resistant. I used the sharp knife and the tweezers to remove the glue on the screws very carefully.
Once the glue removed, to unscrew and open the backpanel were quite easy.
The damaged battery was sticked on inside the backpanel by an adhesive tape. Because the connection points on the PCB were kindly marked as B+/-, there was little risk to connect the new battery wires in the opposite direction.
A replacement battery (503035 with a protection circuit, 3.7 V 500 mAh) could be easily obtained on any ec stores (Amazon, ebay, Aliexpress, Taobao, etc.) for less than 5 US$.
After the replacement by soldering, I switched off the power and closed the backpanel without the glue.
The capacity of the degraded battery at full charge was measured by a constant current sink of 0.5C to be 260 mAh at room temperature of 20 deg C. It was degraded in capacity to about a half.
