Just want to report I’ve also been seeing this regularly on an 11th gen i5. I very rarely use my laptop without the charger plugged in. Max battery percentage is set to 85% and I use either the Framework charger or a Steam Deck charger which both keep the laptop at 84 or 85%.
Every 20 mins to half an hour I get a random single-digit battery percentage reported, asking me to shut down or hibernate, and the following messages:
[97327.451094] cros_ec_lpcs cros_ec_lpcs.0: bad packet checksum f7
[98371.937386] cros_ec_lpcs cros_ec_lpcs.0: bad packet checksum f7
I’ve had these or the “bad packet length” messages for the memorable past (at least a year, maybe 2) and I’m somewhat surprised it hasn’t been fixed yet.