Capacity: 21Ah or 21000mAh
Voltage: 12V
4A intelligent Charger included.
Built-in battery management system: short circuit, over-current discharge, over-discharge protection.
Dimensions: 5.25 x 7 x 3.5
Weight: ~ 2lb
Case: Waterproof case. 
Carry handle for ease of moving.
Case fits through 8" round Hobie hatch.
Battery comes with complete parts for one fishfinder setup, either soldering or crimping.