12V AGM Powercell Battery. 
Can be used as a reserve and/or starting battery.

Specs:
Voltage : 12V
Wattage: Up to 1000W
MAX Amps: 1000
CA: 370A
Ah: 20
RC: 24min
 
Dimensions:
Weight Lbs.: 13.69 lbs
Weight Kgs.: 6.21 kgs
Length: 7.13 in
Height: 6.57 in
Width: 3.03 in
 
M6 Terminal Hardware Included.