12V BCI Group 49 AGM Powercell Battery.
Can be used as a reserve and/or starting battery.

Specs:
Voltage : 12V
Wattage: 3000W / 4000W
MAX Amps: 4000
CA: 1250A
Ah: 100
RC: 178min
 
Dimensions:
Weight Lbs.: 63.8 lbs
Weight Kgs.: 28.94 kgs
Length: 13.90 in
Height: 7.48 in
Width: 6.93 in
 
M6 Terminal Hardware Included.