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Why aren't there 1.5v AA rechargeable batteries? (lemmy.world)

submitted 2 days ago* (last edited 2 days ago) by BeatTakeshi@lemmy.world to c/asklemmy@lemmy.ml

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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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[–] r00ty@kbin.life 11 points 2 days ago (1 children)

Yeah but they're a cheat. They're lithium cells regulated down to 1.5v. Good ones are rare, when you find good ones they're generally expensive and because they're regulated down you generally get 100% battery showing until just before they fail.

I used them for some voltage sensitive stuff, but finding a brand that held a good charge for more than even 50-100 charges was hard.

Nimh is much better for anything that won't be upset about the voltage too much.

[–] StThicket@reddthat.com 2 points 1 day ago

There's a type of lithium batteries that have a fixed voltage drop, meaning it will show the SoC of the lithium cell. I know about a company that just released a charger system meant for professionals that use these cells: https://klvr.no/charger-pro