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this post was submitted on 23 Sep 2025
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That was the original reason. Ni-cad batteries develop a “memory” if they aren’t fully discharged loose capacity.
With modern Lithium ion batteries its because as their capacity decreases over time the BMS can't always keep up and recover the 100% point unless you're occasionally draining it all the way. This can result in someone charging their battery to say 97% and leaving it for hours to reach a 100% it will never reach. This is potentially unsafe as it heats up the battery.
Edit: Autocorrupt beansed up my comment
You're probably already familiar with this resource, but Battery University has some interesting and useful information about batteries and it's accessible enough for the layperson.