Why does my battery charger or jump starter require the battery to have at least 2-4 volts of power to operate?

Our battery chargers and jump starters have reverse polarity sensing circuits. These circuits require asmall amount of power in the battery so the unit can determine if it is connected to the battery correctly or not. This is a safety feature to avoid damaging the unitandthe battery. For assistance with any of our Vector Automotive Products please contact Baccus Global LLC through one of the following: Telephone: 1-877-571-2391 Email: customerservice@baccusllc.com Fax: (561) 361-4228 Website: baccusglobal.com Mail: Baccus Global LLC 595 S Federal Hwy Ste 210 Boca Raton, FL 33432