I’m going to take a stab at it and guess that’s not the full story. There’s likely(?) an additional compounding issue with the FL13 having a battery charge / discharge flip-flopping behaviour when the laptop (processor, more specifically) is under repeated high load.
e.g. [TRACKING] Battery flipping between charging and discharging / Draws from battery even on AC
That’s been a requested feature since 2021…and has been ignored we have yet to see anything reagarding it since then.