After charging, I used them in every AA device I had. I tested them in everything from a cordless beard trimmer to a flashlight. They lasted about 2 hours in trimmer, which isn’t too bad as the trimmer eats batteries. Next I tried them in my AA mini-Maglite, but they would not fit as the cap is too large. . .


Moixa USBCELL USB Rechargeable Batteries - BCCHardware