I believe a few of us have Steam Decks, thus I wanted to do this kinda public announcement. TL;DR If your Steam Deck reports low battery health (low % of original capacity) drain the battery until...
I believe a few of us have Steam Decks, thus I wanted to do this kinda public announcement.
TL;DR
- If your Steam Deck reports low battery health (low % of original capacity) drain the battery until it shuts down and then fully charge and check again
- Use your Steam Deck until it shuts down from time to time (say once every 6 months?) to keep your battery level indicator (and remaining time) precise
Long version
I have my Steam Deck since May 2022 and I put certainly over 1000 hours in gaming on it. I would believe if it was even approaching 2000 hours.
Lately I played demanding game and battery was discharging rather fast with remaining time on full charge being under 1:30 hours, which I wasn't used to just a few months ago when it lasted over 2 hours even in demanding games (I limit to 30 fps and I also limit TDP/power). This weekend I jumped into desktop mode and checked the battery life which showed me what I feared - 65% of original capacity.
I went on iFixit page and the price for new one is hefty 95€, but since Steam Deck got me so much enjoyment, I was ready to pay for it - if it was in stock, that is. I'm glad it wasn't!
Since I have a bit of electronics and software background (hobby level), I realized that the charging chip (or whatever keeps the info about state of charge) was running since day 1 on relative data. What I mean: I have never discharged my Steam Deck lower than 10% and most of the times charging anywhere between 30-80%. And since the charging chip likely measures last fully charged capacity (and thus battery health) based on, well, how much it was charged and discharged all over again, it probably skewed its measurements in those three years.
So I went on a "quest" to play until dead. And I was surprised when Steam Deck reached 3% battery and kept running for another hour (ligthweight game) until it was finally dead. Then I fully charged it and voila - battery health 90%!
I have already said how it likely happened, but once more and in short: the charging chip needs to reach both limits, 0% and 100% of battery, from time to time = You have to let it drain fully here and there if you want your battery level indicator (and remaining time) to be precise or if you want to get the real state of your battery.
A bit offtopic: I've had laptop that had 50% of original capacity. I have changed the battery cells inside the battery and let it fully discharge and charge again but the vendor locked the chip from "learning" the real capacity making the new cells useless because the chip still reported 50% thus telling me when I booted it up that the battery has to be changed and also telling me non-relevant remaining time based on this 50% battery health... I'm glad that Steam Deck is capable of re-learning this data and not playing dumb.