Some can’t.
Depending on the battery technology it’s not always easy.
A great example is the rechargeable batteries I use at home for almost everything.
They are NiZn and I like that they have a stable voltage all the time. But when they are completely empty it drops instantly.
Stable voltage is cool but you get no warning when it’s about to run out.
On my quest 3 controllers or xbox one controller it says they are completely full, completely full, BOOM turn off, no warning. Kinda annoying and I wish I knew that before replacing all my NiMh.
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