Just got these WENJOOP AAA rechargeable batteries and here's my honest take after using them for a few weeks.
First off, the 16-pack with storage case is super convenient. No more loose batteries rolling around in drawers! They came pre-charged which was perfect for immediately powering my kid's toys and TV remotes.
The capacity claims seem a bit exaggerated though. Like other reviewers mentioned, they test closer to 800-850mAh rather than the advertised 1100mAh. Not a dealbreaker for most household uses, but don't expect professional-grade performance.
One minor annoyance - the battery wraps are slightly thicker than standard AAAs. Had to really push them into some of my devices' battery compartments. They did eventually fit though.
On the plus side, they've been holding charge well in my blood pressure monitor (which usually drains batteries fast). After several daily uses over a week, they're still going strong!
For the price, these are decent eco-friendly alternatives to disposables. Just manage your expectations about the actual capacity and you won't be disappointed.