Skip the auto shop - Our mechanics make house calls

Q: Battery gets drained, recharging the battery

asked by on

I haven't been driving my car much and it has only 32,000 miles on it. I've been having problems with the battery getting drained, probably because the car sits too long. I've read in the manual that it's not recommended to get it recharged while it's in the car, but there are remote terminals for jumpstart, located in the trunk. Are they safe to use for battery recharge? The battery is very hard to get out, so can I use the terminals that are in the trunk and not get the battery out?

A: Hello, the best thing to do in your case is...

Hello, the best thing to do in your case is to install a battery shut off switch. However, you are indicating that your battery is perhaps not accessible enough for such a retrofit. And, of course, if you disconnect the battery you lose anti-theft (alarm) protection as well as the possibility of losing stored info in the PCM.

Generally, the issue with charging in situ is if the charger has a voltage excursion (above 14 volts) which, if it occurred, could damage the PCM and vehicle electronics. Just to be on the safe side, Jaguar simply just says to disconnect the battery. If you are using a high quality professional charger, you are probably safe in leaving the battery connected while charging.

The charging circuit is running through the battery and the likelihood of runaway voltage if you are using a decent charger is low. Note that, even if you use a shut off, lead acid batteries will self discharge anyway, so you will still have to charge the battery every several weeks if you are not using the car. Watch out for gas in the tank oxidizing. Keep the tank full and use fuel stabilizer applied to fresh gas. If the gas goes bad and plugs injectors, you will wish you had "only" a dead battery. If you are continuing to have problems with your battery, a qualified professional from YourMechanic can diagnose the charging issue so that you will not have to keep charging it.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: Convertible top not latching, or going up or down

Convertible tops are complex mechanisms. There are many parts that have to work in sync for proper operation. Diagnosing one that is not working properly would require someone with the proper knowledge to inspect it, one part at a time....

Q: Whining noise, fuel system issue

Hello. You should stop driving the car until this is addressed. You didn't specify where fuel was squirting out, but in any case, this is a serious safety hazard. Given the age of your vehicle, and that it as been...

Q: What does the liftgate ajar Warning Light mean?

The liftgate ajar Warning Light is located on the instrument panel. This light illuminates when your trunk is not properly closed. Secure your trunk properly, and the light will turn off.

Related articles

How to Renew Your Car Registration in Oklahoma(DELETED)
Having your car registered with the Oklahoma Tax Commission is an important part of driving legally in this state. You will need to do this within 30 days of moving to Oklahoma...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...