I notice those batteries that get marked with higher capacity discharge prematurely. I've since switched to 800mah 3.7v 50mm height batteries with tab. Since then, no issues with battery drain. It's also a good idea not to trust the battery gauge and charge it overnight just to be safe. A sure method is to use an external charger to charge fully and then install the batteries. That way you know the batteries are good to go and every other charge after will just top off the power.

Hmm interesting thanks. I thought the XTAR 1200s would be good quality since I'd seen people had good performance out of the XTAR 800s.

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Hi guys, I got the new eRX gen 3 (type c charging)

I've used XTAR 1200mah batteries for it. My first shakedown ride was a 4 hour 130km cycle and about 3.5h into the ride it went flat/stopped working. When I left for the ride it said it had 90% battery.

When I plugged back in after the ride the groupset came back to life it said it had like 80% left.

Any ideas what might of happened here? Does the battery level thing need time to calibrate?