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this post was submitted on 07 Aug 2023
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Technology
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Couldn't it theoretically be fixed with a voltage regulator?
Don't they need a circuit protection to not over-discharge lithium batteries? Most AA devices would suck all the juice from the battery until it stops working.
Yes.
The other problem with lithium batteries like 18650s is that they need to be handled with care so manufacturers don't want users swapping them in and out like AA/AAA. This is why they build them into devices and have you charge them through a regulated port.
Well there aren't really different sizes of 18650s, if you chance the size it's no longer an 18650.
The flat vs button top issue can be annoying though
The problem with those is that the device loses the ability to sense the charge status of the battery, since the voltage remains the same until it’s empty.
NiMH AA's have the same problem.