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Why doesn’t the steamdeck hibernate by default?
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this post was submitted on 25 Aug 2023
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Steam Hardware
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It’s worse than storing it in the ideal zone - between 3.6 and 4.0 volts (% means nothing if we’re getting technical as there is an interpretation later in software). Constantly at 4.2 is bad, dropping below 3.0 is very very bad, and going to ~2.7(iirc) is simply murder. I have a telemetry module in a rocket which doors not have a low voltage cut off and every time I’ve left it on at least one cell in the lipo is permanently damaged.
In the telemetry case, it’s designed to run absolutely a long s as possible because the cost of a (interchangeable) battery is small compared to the cost of the rocket and telemetry payload.
I’m not a battery expert, but I’ve left lipos in computers and phones on chargers for years without substantial/excessive deterioration relative to their number of charge/discharge cycles; my experience with the telemetry makes me more wary of full discharge as a cell damage condition (not a direct analog as the deck certainly shuts down before lipo cell death)
—-I should point out that I’m not terribly worried about battery damage - that’s a red herring. I’m just pissed when I grab my deck and its battery is dead and I was hoping to squeeze in a quick game. :-)
Below the 3.0 volt limit will reduce usable cycle count by 30-80% Everytime the cell drops that low. Charging over 4.1 will reduce usable cycle count as well.
Example # of usable cycles if you stop discharge at 3.2 and stop charging at 4.0 for modern lipos can be 5000-10000 cycles.
Charging to 4.3 every cycle (phone batteries are rated to 4.3 not 4.2... it's why they have the larger than expected wh capacity numbers) will reduce that to 500.
Discharge it to 2.5 and you will get 10-50 cycles.
For those who are just looking at the SD or their phones... Most devices report 0% at 3 or 3.1v and 100% at 4.3 or 4.2 volts... So basically discharging to 0% doesn't matter... It's the charging to 100% that matters to most people.
If you charge to 100% you will get about 500 charges (it doesn't matter what the % is you start at is... 90% -> 100% is the same one cycle as 20% -> 100%). That's about two years of use for most people before your battery starts to suffer and you will see noticable decrease in battery life.
If you charge to 70% you will get about 10 years before you will see a drop in battery life. 80% will get you about 6-8 years.