Let's talk about these Mupoer rechargeable AA batteries. First off, the 2800mAh capacity sounds impressive on paper. In real use? They do hold up pretty well in my Xbox controller - lasting about as long as my Eneloops but at half the price.

The low self-discharge claim seems legit. I left a pair in my emergency flashlight for 3 months and they still had enough juice when I needed them. No leakage issues either, which is always a plus.

Now here's the catch: that 2800mAh rating might be optimistic. My testing showed closer to 2100-2300mAh actual capacity after a few charge cycles. Still decent, but don't expect true 2800 performance.

Biggest annoyance? The batteries don't clearly say 'rechargeable' on them - had to dig up the Amazon receipt to confirm when someone asked. Weird oversight for rechargeables.

For the price though? Solid value. They work great in high-drain devices like digital cameras and gaming controllers. Just temper your expectations on that capacity rating.