Bests & Worsts Reviews from Amazon

I typically don't leave reviews, however, I don't want others to make the same mistake I made. These are listed as 5800mAh. I wanted to use them for my Fenix headlamp. I charged them for 24hrs. Both batteries were at 4.29V exactly. I placed one in my headlamp, and it only lasted about 15 minutes on medium brightness. The Fenix 2600mAh battery that came with the headlamp lasts two hours on medium brightness. These are definitely not 5800mAh, more likely around 1000mAh. Charger seems to work fine.