Thinkpad T480 battery issues

Hello guys,

so far everything is working fine. The laptop has two batteries, but battery 0 is drained until 0 % and the laptop is crashing, although battery 1 is still on 100 %. How can I check why the system is not changing to battery 1? I guess it's only happening when using ports compiling. Otherwise it's working, but I have to prove it.

Greetings
Peter
 
Yes, while compiling the battery 0 is drained completely and the display goes black, laptop off. Normally it should switch to battery 1 when battery 0 reached 5 %.
In any other situation it's working, only when using ports or synth it crashes without switching to battery 1
 
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