this post was submitted on 08 Aug 2026
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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.