The Studica Robotics 12V 3000 mAh NiMH (nickel metal hydride) Battery Pack, PP45 - ARES in Black comes with a w/20 amp fuse. It is a 10-cell, 12-volt rechargeable battery pack.  

The Studica Robotics NiMH Battery Pack Charger, PP45 ARES, is required to charge the battery. 

Note: This battery is legal for FIRST (FTC) competitions.