When a cars battery runs out of energy and you use another car to give it energy with jumper cables. Does the good car feed the bad car with energy from its battery? The longer I leave it plugged and running does it charge more or is it a waste of time?
2007-04-14 03:43:07 · 9 answers · asked by talent4god 2 in Cars & Transportation ➔ Maintenance & Repairs
Fully charging a battery requires more voltage than the normal battery charge. That's why a vehicle's alternator usually generates over 14 volts, while the standard battery voltage is 12.6 volts. You cannot fully charge a battery just by connecting it to another battery, but you can charge it by connecting it to the battery in a vehicle with the engine running so that it's charged by the alternator.
2007-04-14 04:20:47 · answer #1 · answered by KaeZoo 7 · 0⤊ 1⤋
When using jumper cables the car that you are getting a jump from will charge your cars battery. It will get a charge from the other cars alternator not from its battery. Though you hook up to the cars battery its the cars alternator doing the work. So the other cars needs to be running to do this. Also it will take some time to charge your battery. So the longer you have it hooked up the more of a charge your battery will get. This does however put a large load on the other cars alternator which can cause the alternator to overheat and fail.
2007-04-14 03:55:03 · answer #2 · answered by akicestorm 2 · 0⤊ 0⤋
Yes, the good car will charge the battery of the bad car using jumper cables. The batteries are connected in parallel. Ohms law states voltage in parallel must be equal. so since the good cars battery would be fully charged the alternator would send most of its current (amps) to the other battery.
Alternator output - the load used by the good car (lights, electronics= the available current sent to the bad car.
2007-04-14 20:05:12 · answer #3 · answered by gulf9191 2 · 0⤊ 0⤋
waste of time, if your alternator is working, once the car is started it is charging the battery, I'd drive around a bit(15-20 minutes) then shut car off, then try to start it again,you might need a new battery/ or alternator, or just clean the battery terminals. Good Luck!!
2007-04-14 20:18:46 · answer #4 · answered by Cynthia B 3 · 0⤊ 0⤋
sure, just hook up jumper cables,from the good battery and hook the other end to the dead battery and start the car,with the good battery and it will charge the dead battery,but its best that you try to start the car and after it starts,unhook the cables,and the alternator will fully charge the dead battery.
2007-04-14 03:51:37 · answer #5 · answered by Anonymous · 0⤊ 0⤋
If I understand you correctly, yes the alternator will charge both batteries. That is presuming the "dead" battery didn't go dead because of weak cells, but rather you left a radio or lights on...
2007-04-14 03:49:43 · answer #6 · answered by Michael B 6 · 0⤊ 0⤋
i might first propose which you get an oem extreme OUTPUT alternator to grant adequate voltage on your device and motor vehicle upload-ons. an extra battery might help yet, quite often while you're stopped and only listening to the radio. in case you get an extra battery i might propose you get a battery isolator. It distributes the voltage to the two batteries and while your stopped, only listening to the radio the isolator saves amperage to the main battery so which you will start your vehicle.
2016-10-22 03:42:09 · answer #7 · answered by pereyra 4 · 0⤊ 0⤋
Did u pull up the two caps on top and make sure they are full of water to top? It CAN recharge it some BUT if the battery being charged is really old it won't hold a charge. You might just have to get a ride to get a new one. Bring your old battery so u don't have to pay an extra "core" charge.
2007-04-14 03:50:11 · answer #8 · answered by des 3 · 0⤊ 3⤋
if the dead battery is still good (only discharged) the jump will charge the battery. if the dead battery is bad it will not accept the charge
2007-04-14 03:52:27 · answer #9 · answered by smokey 7 · 0⤊ 0⤋