mWh vs mAh

[Mpegger]

I have some Li-Ion powered AA batteries, which have a rating of 3400mWh, and output 1.5V just like a normal Alkaline AA battery. These batteries have thier own charger, which afaik, is the only charger that should be used with such batteries. However, being Li-Ion I don't want to leave them fully charged when they are sitting around doing nothing as Li-Ion can degrade because of that, so I want to be able to discharge them about 50% before storage. The charger included with the batteries only charges, so I need to use one of my other battery maintainers to do the discharge.

Pluging in 3400mWh @ 1.5V into a mWh > mAh calculator, I get around 2266mAh. But then I got to thinking about the conversion from 3.7V to 1.5V and started wondering if the math is correct. 3400mWh @ 3.7V is about 920mAh, which is what AA sized Li-ion batteries which output 3.7V are typically rated at. So now I'm confused as to how many mA I should drain from these batteries, which outputs 1.5V because of the built in step down voltage converter, to leave them around 50%. 1133mA? Or 460mA?

I'm just confused about voltage being stepped down. Does the available mA capacity go up? Or does the capacity stay the same?

[tszaboo]

mA goes up. This is about 2Ah on 1.5V.
I would just discharge it for about a few hundred mA, and store it like that. I don't think it's going to make a lot of difference, not enough to worry about.

[default0.0player]

Niche AA battery chemistries like 1.5V Li-ion and NiZn manufacturers like to label their batteries mWh instead of mAh to make the numbers look good. They are generally worse than NiMH batteries.

https://lygte-info.dk/review/batteries2012/Kentli%20AA%202800mWh%20%28Blue%29%20UK.html

The trick is the connection to the battery, it must connect to the ring around the plus pole and not the button top on the battery.

Connect the "ring" and the negative pole, and charge/discharge to 3.8V before storage