Battery drained 8% in 13 hours while shut down?

[Hank Hill's Disappointed Sigh]

I got my RMA unit last week and I noticed the battery drains a lot more than the initial unit while shut down (not asleep).
My first unit would only drain maybe ~1% over night if completely shut down. 8% seems like a lot. Is this normal? This is from a full charge.

Also the unit has a somewhat erratic battery health reading and has fluctuated between 94-98% health. My first unit showed 100% the whole time I had it.

What is happening here?

[derram]

Anything above 90% is considered fine for battery health, from what I've read.

You can try to calibrate the battery to see if the drain is just due to bad estimates:

1. Turn your steam deck off, plug it in and then press the + volume button and the power button at the same time. This will boot your machine into the BIOS menu.

2. Unplug and leave your steam deck to sit and FULLY DRAIN overnight. In this mode, your deck will not go to sleep and will not randomly shut off.

3. Once the deck is fully drained, plug it back in. If your deck turns on automatically, unplug it and let it die a second time; It is important that the deck starts at 0% and stays turned off for step 4.

4. Let it FULLY charge from 0% all the way back up to full while it stays off; This should take approximately 5-8 hours.

[karmazyn1]

My SD drained more than expected once but it happened once only.