Can a Car Battery Overheat in Hot Weather?

If it’s hot outside, and you’re experiencing car battery problems, you may be wondering if it’s possible for your battery to overheat. The answer isn’t really a straight yes or no.

Generally speaking, your car battery can withstand most types of weather as long as your car is in regular use and you’re practicing proper battery care. Summer car maintenance, however, means that you do have to keep an eye on your battery, because extreme heat can cause battery fluid to evaporate. When this happens, your battery itself doesn’t exactly overheat, but the fluid evaporation can cause, or exacerbate, problems with overcharging.

Battery overcharging can decrease the lifespan of your battery, making it more difficult for it to deliver the power to turn over your engine. Fortunately, it’s easy to avoid. So, what causes your battery to overcharge?

Defective voltage regulator

If your voltage regulator isn’t performing effectively, that can cause car battery problems. The voltage regulator is the component in the alternator that sends the charge to your battery, and if sends too much, the battery will overcharge.

Defective alternator

The problem could be the alternator itself. The alternator uses the engine power to deliver a charge to the battery, and when it doesn’t work properly, it can deliver too much charge to the battery.

Improper charger use

If you’re having car battery problems, and you’re using a charger, you need to be sure that you don’t leave it on the charger too long. This will significantly reduce the lifespan of your battery.

Sometimes, the charger itself can be at fault. Maybe it’s not properly wired, or the labeling is wrong. Even if you’re monitoring the charger, you could still end up with an overcharged battery.

Have a professional mechanic check your battery fluid as a part of your summer car maintenance routine, and your battery should perform properly even in the hottest summer months.


The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

Related articles

How to Diagnose a Stalling Car
It’s It’s incredibly frustrating to have a car that stalls and it always seems to happen at the worst possible time – like when you’re in middle of a busy intersection with fifty enraged drivers behind you. There are a...
How to Change Battery Cables
Although simple in nature, battery cables (https://www.yourmechanic.com/article/symptoms-of-a-bad-or-failing-battery-cable) are one of the most important components of a vehicle’s electrical system. They serve as...
How To Jumpstart Your Car
A how-to guide to jumpstart your vehicle in the event of a dead battery. You'll need jumper cables, safety glasses, and a properly starting car.

Related questions

Car not starting due to battery
If your vehicle does not crank, nothing operates electronically in the vehicle, then yes the battery might be dead. Depending on the age of the battery it might just be old and not holding a charge. If it is a...
I think the motor is having a starting issue. New battery, separate solenoid, and put in a new starter. Are all the cables good?
Hey there. The starting system has to turn the engine over at a certain minimum rate (RPM) in order for the engine to catch and run. If there is no voltage drop between a new fully charged battery and the...
Vehicle won't start...one click.
Hi there. What seems to be happening is there is a parasitic load on the battery when the ignition key is off. What this means is that something is on when it should be off. To check this condition, first...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1 (844) 997-3624 · hi@yourmechanic.com