I'm just about to buy (on Ali Express) some more Li ion AAA's having bought some AA's a few years ago.
From what I've researched it seems that the only Li ion AAA sized batteries are the ones that come with the RC toys and have a output voltage of about 4v.
The AA's (1.5v, 2800mWh) I bought a couple of years ago have been exceptional. I was wary of them to start with because of their high price and not being available in NZ but they've proven to be so good I'm now wondering why the hell you can't buy them here and avoid the long wait for overseas delivery?
The only problem I've encountered with them has been one toy which wouldn't work with them. I suspect it was expecting <1.5v but it got exactly 1.5v from each.
Someone gave my son a really cheap RC car which ran on AA's and when I put these in it went like stink and lasted ages before needing a re-charge.
Anyone else bought these and had trouble with them? I'm wondering why they've never become mass market since the NiHM seem so dated and awful in comparison?