I’ve completely replaced the battery module. Created a custom pack from two protected 21700 batteries connected in series (2S). Added a separate balanced charging controller with USB-C. And used a step down converter that outputs constant 4.2V. Also used a voltage testing strip to see actual battery percentage. Why I did this - original approach with batteries in 1S configuration was not enough to power CM5; under load as soon as battery voltage dropped below 3.8V my console would hard freeze. What I gained - bigger capacity batteries, that can power CM5 from 100% till the very zero (8.4v - 6v) under load. What I lost - system battery indicator (it even became a problem for now), ability to charge from the existing USB-C port. I am still testing this whole setup, but so far so good. I need to find out how to disable battery driver. Also there were a couple of random shutdowns during torture tests, but they were easily recoverable.
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