this post was submitted on 08 Aug 2026
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Lithium ion batteries cannot super accurately report their own charge so the percentage isn't necessarily digit accurate.
I am also usually just making sure it'll get me to a place I can charge it when I actually need to worry about charge. That doesn't usually require like the difference between say 33% and 26% for me.
I just need to be able to see if I've got like a fifth of battery left or less / more.
Admitedly also with the ADHD if there's a percentage I fixate on it for no reason so it's less annoying for me to have it off.
Same with the battery level in my e-bike. ๐ I know it'll get me to work and back as it always does but not constantly fixating on the remaining battery is impossible.
You can absolutely accurately calculate the percentage of a lithium battery. I do so every day with solar setup I live on. Even after months floating between 20% and 80% the batteries stop charging at 99.5% and would shut off if I hit 0-1%
You just need to use a well calibrated shunt.
Knowing fully charged and completely dead is easy. Knowing when the battery is 52% charged vs 53% charged is just an estimate.