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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]

35 comments fedilink hide all child comments

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] 25 points 5 days ago (3 children)

But there are 1.5v rechargeable AA batteries out there.

[–] [email protected] 11 points 5 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.

[–] [email protected] 2 points 4 days 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

[–] BeatTakeshi 6 points 5 days ago (1 children)

Thanks, indeed. I was searching NiMH 1.5v, but indeed in lithium there are 1.5v

[–] [email protected] 3 points 5 days ago

I have some thermo regulated valves that require 1.5v as well, so for those I decided to go with regular alcaline batteries. Those are still above 80% charge after 1 year of usage, that is why I decided not going with rechargeables for those trvs

[–] BombOmOm 2 points 5 days ago* (last edited 5 days ago)

Yeah, I have some EBL brand 1.5v rechargeable batteries since the VR handsets I own are pretty sensitive to low voltage. They were unfortunately a bit more expensive than regular 1.2v rechargeables.