7.4V 2000Mah Version 2 Pack Size: 3.31"x 1.42"x.67" (LxWxH) Discharge Rate: 16 Amps For use with stock spring guns Price: $21.00   7.4V 2000Mah Version 2 Pack Size: 3.31"x 1.30"x.71" (LxWxH) Discharge Rate: 20 Amps For use with stock spring guns And up to 120M Spring Price: $29.00   7.4V 2000Mah Version 2 Pack Size: 3.94"x 1.26"x.67" (LxWxH) Discharge Rate: 31 Amps For use with stock spring guns And up to 150M Spring Price: $45.00   11.1V 3850Mah Size: 5.35"x 1.97"x.98" (LxWxH) Discharge Rate: 38.5 Amps For use with upgraded guns And Up to 170M Spring Price: $84.00