A look at some possibly-fake random “NiMH” AA cells from AliExpress, comparing them to Panasonic Eneloop cells.
From my somewhat limited testing, these little green guys had an actual capacity of about 342mAh, which is less than 10% of their claimed specification of 3800mAh (which is probably impossible anyhow for AA-sized NiMH cells.
The part about them perhaps not being real NiMH cells? That’s not the weirdest thing. Unlike most of my AliExpress purchases, these shipped from The Netherlands, despite the seller being called Shenzhen DeKang International Trade.