12V BCI Group 27 AGM Powercell Battery.
Can be used as a reserve and/or starting battery.

Specs:
Voltage : 12V
Wattage: 3500W / 4500W
MAX Amps: 4,300
CA: 1300A
Ah: 113
RC: 239min
 
Dimensions:
Weight Lbs.: 69.89 lbs
Weight Kgs.: 31.7 kgs
Length: 12.09 in
Height: 8.31 in
Width: 6.65 in
 
M6 Terminal Hardware Included.