How Many 9 Volt Batteries to Start a Car

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• #1

i really need to know cause i have a bronco 2 i need to drive asap to work and the battery is dead can i charge the battery with a little 9v battery

Mar 11, 2011

9,478

7

54,965

2,328

• #3

Not to mention the 9v battery is so small it lacks the capacity. Even if a small 9v battery were capable of 12v, it would discharge whatever power was saved up before it even managed to crank the motor once. Sort of like trying to wash a car with a squirt gun vs a hose. The squirt gun may put out just as much pressure but one or two squirts aren't going to even wet the whole car where a hose can fully rinse it due to much higher volume of water (continual supply).

Options would be a 12v trickle charger (slow, takes hours typically), or for immediate results jumper cables and slave starting off another vehicle or a charged jump pack (smaller version of a 12v battery designed for emergency starting like jumper cables without another vehicle).

Also something to keep in mind, depending on the condition of the battery a simple jump start may work if the battery is just dead enough that it won't start your vehicle. If it's in really bad shape it may not hold much of a charge at all and will leave you stranded again once you reach work or your destination. If the battery's ability to retain much if any charge is that compromised the vehicle could stall while driving as well. A battery in really poor condition could put extra strain on the alternator as well.

Dec 2, 2009

38,694

929

129,290

8,562

• #2

No you can't. To charge a 12v battery you need something that puts out at least 12v. (and up to about 14.5v for a car battery)

Mar 11, 2011

9,478

7

54,965

2,328

• #3

Not to mention the 9v battery is so small it lacks the capacity. Even if a small 9v battery were capable of 12v, it would discharge whatever power was saved up before it even managed to crank the motor once. Sort of like trying to wash a car with a squirt gun vs a hose. The squirt gun may put out just as much pressure but one or two squirts aren't going to even wet the whole car where a hose can fully rinse it due to much higher volume of water (continual supply).

Options would be a 12v trickle charger (slow, takes hours typically), or for immediate results jumper cables and slave starting off another vehicle or a charged jump pack (smaller version of a 12v battery designed for emergency starting like jumper cables without another vehicle).

Also something to keep in mind, depending on the condition of the battery a simple jump start may work if the battery is just dead enough that it won't start your vehicle. If it's in really bad shape it may not hold much of a charge at all and will leave you stranded again once you reach work or your destination. If the battery's ability to retain much if any charge is that compromised the vehicle could stall while driving as well. A battery in really poor condition could put extra strain on the alternator as well.

• #4

Not to mention the 9v battery is so small it lacks the capacity. Even if a small 9v battery were capable of 12v, it would discharge whatever power was saved up before it even managed to crank the motor once. Sort of like trying to wash a car with a squirt gun vs a hose. The squirt gun may put out just as much pressure but one or two squirts aren't going to even wet the whole car where a hose can fully rinse it due to much higher volume of water (continual supply).

Options would be a 12v trickle charger (slow, takes hours typically), or for immediate results jumper cables and slave starting off another vehicle or a charged jump pack (smaller version of a 12v battery designed for emergency starting like jumper cables without another vehicle).

Also something to keep in mind, depending on the condition of the battery a simple jump start may work if the battery is just dead enough that it won't start your vehicle. If it's in really bad shape it may not hold much of a charge at all and will leave you stranded again once you reach work or your destination. If the battery's ability to retain much if any charge is that compromised the vehicle could stall while driving as well. A battery in really poor condition could put extra strain on the alternator as well.

• #5

Agree with your thought.
Base on my research, the dead battery shows high resistance. It was cased by PbSO4 did not be removed 100% during charging period. All you need is a perfect charger to remove PbSO4 from Pb plat.
What is a perfect charger? We found the pulse voltage can generate pulse current which can easy perform this function. It takes 2~16 hours as normal charging process to get back your battery capacity in normal. Of course the plat must be no broken.

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How Many 9 Volt Batteries to Start a Car

Source: https://forums.tomshardware.com/threads/can-i-charge-a-car-battery-with-a-little-9v-battery.2645971/

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