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

Specs:
Voltage : 12V
Wattage: Up to 600W
MAX Amps: 800
CA: 276A
Ah: 17
RC: 22min
 
Dimensions:
Weight Lbs.: 11.24 lbs
Weight Kgs.: 5.1 kgs
Length: 6.04 in
Height: 5.14 in
Width: 3.38 in
 
M6 Terminal Hardware Included.