MFJ-4416B Battery voltage booster, 12V MFJ-4416 Super Battery Booster eliminates low voltage problems by boosting input voltages as low as 9 volts up to the desired 13.8 volts It is compact at just 73/4Wx4Hx21/8D and lightweight at 1.3 lbs MFJ-4416 includes Anderson PowerPoleTM connectors MFJ-4116 protect you from lower voltages. MFJ- 4416 Super Battery Booster is designed to be rugged, reliable, and easy to use.