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

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Restricted Performance message on dashboard

When the controller sees a misfire, it shuts the fuel off to the offending cylinder, hence your "restricted performance" message. Your friend may be right because coil failures are quite common on the Jaguars. P0357 says your failure is on...

Q: Vacuum leak

Hi. This is a very common failure on vehicles like yours. So common, in fact, that there is a technical service bulletin (TSB) on it. The TSB is XT303-13 and it addressed the hissing sound from under the hood, as...

Q: Trunk not closing

Hello. First, please keep in mind that the trunk cannot be locked until the convertible top is completely up or down. This prevents any components from binding and becoming stuck or broken. Have a mechanic, such as our YourMechanic experts,...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
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...