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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

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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[–] Evotech@lemmy.world 10 points 2 days ago* (last edited 2 days ago) (2 children)

Huh, I use exclusively rechargeable batteries in everything. Works great.

Except the smoke alarm, that one complains if I don't use lithium

[–] Analog@lemmy.ml 1 points 1 day ago (1 children)

Google seems to have set their nest protect units to need six lithium AA non-rechargeable cells. Which is 1.8v, not 1.5v. You put in completely fresh batteries verified with a multimeter at above 1.5v (1.58v iirc) and they’ll complain about it.

I bought lithium rechargeable and they’re 1.5v. Which seems reasonable. I wish all of ‘em would be one standard.

Feels instead like we have AA-, AA, and AA+.

[–] Evotech@lemmy.world 1 points 1 day ago

Huh yeah, guess I got lucky when I purchased extras for mine.

[–] treadful@lemmy.zip 7 points 2 days ago (2 children)

Same. Temp sensors, flashlights, game controllers, thermostat, whatever. Haven't had any issues.

The only time they suck is when a device wants an odd number of batteries. And my charger only works with tandem batteries. Not really sure of the implications, but charging two batteries with significantly different charge makes me nervous.

[–] dsilverz@thelemmy.club 6 points 2 days ago

There are battery chargers that allow charging an odd number of batteries, even single batteries. I have a charger that is powered through USB, similar to the following:

The one I have has two power inputs: an USB-C and Micro USB, so it can be powered by any of these.

[–] Evotech@lemmy.world 6 points 2 days ago* (last edited 2 days ago)

Idk, I use one that charges 8. Both double and triple A's

Always have spares in the charger ready to go