Found these at Menards, to cheap not to check out for a battery!

Picked this up today at Menards on clearance, $2.50... Comes with a usb cable and lanyard, rated for 2600mAH. I bought it for the battery. I picked up 2 of them and the first battery is in the Xtar charger right now, it arrived at 3.88v. I wish I had a good way to test capacity.

Does anyone know what battery this is? No manufacturer name on it.