# Can you charge a battery with another battery?

by Phil Borges // in Articles

How do you charge a car battery? Is there a way to charge it with another battery? This blog post will answer all your questions and more. If you're looking for the best information on how to maintain, replace, or recharge your vehicle's battery, then this is the place for you.

## Can you charge a car battery with another battery?

If your battery dies, you could call a tow truck, but it might be easier to charge the battery with another. A lot of people don't even know that this is possible. In fact, there are many ways to start a vehicle without using the key or pulling out jumper cables from the trunk. One way is to connect one battery's positive terminal (the red cable) to another's negative terminal (black). Other methods include connecting two metal objects like an iron pipe and steel wool or hooking up jumper cables in reverse order. Nowadays, some cars come equipped with special devices that allow them to power themselves on when parked for an extended period of time. But either way, it pays off knowing all these tricks in case of an emergency.

You can charge your car battery with another battery. But before you start hooking up jumper cables to your neighbor's old clunker, here are some things to consider first: what kind of batteries do they use in the cars? Do they match? What voltage is needed for each car? And if one of them has a higher voltage than the other (e.g., 12-volt vs. 6-volt), will that cause an explosion or electrocution or something else unpleasant happening to someone who touched them together wrong?

When it comes to batteries, knowledge is power! So the next time your car battery dies on you, don't panic. Just remember these simple tips, and you'll be back on the road in no time. And if all else fails, there's always that tow truck waiting for you.

## How do you charge a 12 volt battery with a 12 volt battery?

This is not as simple as it sounds. You may think that two 12V batteries will charge each other if they're both drained out to less than 10 volts, but this isn't possible. If you try and the first one has a higher voltage (for example, 9 or 11), then it would damage your unit - because as soon as there are no more differences in their electrical charges left, things start getting hot.

This means internal resistance starts rising too, which causes increased losses during current flow through wires etc., affecting power transfer rates dramatically even though efficiency might not seem affected at first glance.

In principle, it is possible to use a higher voltage battery to recharge a lower voltage battery. However, doing this presents several challenges that must be overcome before such an approach can be safely implemented.

For example, if the batteries are not identical (in terms of chemical makeup, age, and state of charge), the charging process can be very dangerous. In fact, it's not unheard of for batteries to explode during the charging process when mismatches occur.

So what is the best way to go about recharging a battery? The answer depends on your situation. If you have access to a 12V power supply, then the best way to recharge your 12V battery is by using another similar-capacity 12V power supply.

However, if you have access to a 24V source, it will be safer and more efficient to use that instead of two 12Vs placed in series (i.e., one after the other). If this still doesn't work for some reason, then it would be best to have your 12V battery professionally recharged.

## Can you charge a 12V battery with a car battery?

The answer is, surprisingly, yes. You can charge one large or deep cycle lead-acid battery with another smaller capacity (voltage) battery. However, there are some power limitations that must be considered when doing so.

That also depends on the individual batteries because it's hard to give general advice about the charging process without knowing the specific strengths of each.

Generally, lead-acid batteries are not designed to be charged in this way. But please keep in mind that 12 volt batteries often have different voltage ratings, so if you are trying to charge a 6 volts battery with a 12 volts battery, that might work for one minute but then overcharged it because there is too much energy being passed between them.

Lithium-ion does not use battery tolerance ratings. They only use watt-hours tolerance instead. Yet lithium-ion can't be cycled anymore than once per day, which implies that they need more time to recover from full discharge levels before recharging them again generally.

That's why they are not designed to be charged in the way that lead-acid batteries are. If you want to charge a lithium-ion battery with another lithium-ion battery, then it is also possible if both of them have similar watt-hour ratings and are at the same state of discharge or full capacity. For example, most power tools that use lithium-ion batteries come with two batteries.

It is possible to charge a battery with another battery as long as they have similar watt-hour ratings and are at the same state of discharge or full capacity. But please keep in mind that not all batteries are designed to be charged this way, so always consult your user manual before attempting to charge your batteries this way.

## Can you fully charge a car battery with jumper cables?

You can charge a car battery with jumper cables, but it's not always the best idea. If you have a battery charger, that's the better way to go. Jumper cables are meant for jumpstarting a car, not charging it. Charging a battery with jumper cables can damage it. It can also damage the battery charger if you leave them connected for too long.

You don't want to use jumper cables on your car battery because there are risks involved with doing so, including damaging the vehicle's electrical system and even starting a fire! If you need to give someone else a jumpstart, go ahead and use jumper cables, but only if you know what you're doing. For charging a car battery, use a battery charger instead. It's the safer option, and it will get the job done better than jumper cables.

In conclusion, you can charge a battery with another battery, but it is not safe or effective. Use a battery charger to charge your car battery instead. It is the better option, and it is much safer than using jumper cables.