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Why aren't there 1.5v AA rechargeable batteries? (self.asklemmy)

submitted 5 days ago* (last edited 5 days ago) by BeatTakeshi to c/[email protected]

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I bought a bunch of eneloop pro, but using them in connected thermostats is always displaying "low battery" even after just fully charged. This is when I discovered that they are actually 1.2V

It really came as a surprise, is there a catch? Are they only good for low power stuff like remote controls?

Edit: it seems they do exist in lithium. Question remains why are the NiMH only 1.2v and why are they the most widespread?

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[–] [email protected] 37 points 5 days ago* (last edited 5 days ago) (1 children)

It boils down to chemistry. The nickle-metal-hydride chemistry used in rechargeable batteries just don't produce 1.5V (explaining why is a lot more complicated), while the alkaline chemistry in non-rechargable batteries produces slightly more volts.In the same vein, lithium-ion batteries produce around 3.6V, while lead-acid produce about 12.4V.

To answer your other question, they should be able to power most things that aren't an analog clock (which might run slightly slow).

[–] [email protected] 31 points 5 days ago

Lead acid is actually closer to 2v/cell. Car batteries are 6 cells in series.