1 Cold cranking amps (CCA)
is a measurement of the number of amps a battery can deliver at 0 ° F for 30 seconds and not drop below 7.2 volts. So a high CCA battery rating is especially important in starting battery applications, and in cold weather. You do not need a jumpstarter with the same rating as the battery. A lower rating is usually acceptable.
2 The two batteries are interconnected. When jump starting just connect to either battery. Again, CCA can be lower than the sum of the batteries.
3 When using the jump starter, the vehicle will only pull as much power as is needed from the jump start battery. There is no chance of overloading the vehicles electrical system.
5 The higher the CCA rating, the better the chance of starting a vehicle with a dead battery. A jump starter with at leas a 500 CCA rating should be able to start just about any vehicle with a dead battery.
6 Yes, a reverse polarity indicator will let you know if you have connected the cables backwards. This will give you the opportunity to correct the connections before attempting to start the vehicle.
makes a portabel jumpstarter with 500 cranking amps and reverse polarity protection.
When using a jump starter, power will flow into the dead battery and to the starter motor both, that is why it is harder to start a car with a battery that is completely dead, the dead battery will absorb more of the power.