Ask an expert

Hi, I have a 2014 Subaru Forester XT (2.0 litre) and have had problems with the battery discharging to flat because of low usage and frequent short trips. I had the battery tested by my local Subaru service department, who said that it is not defective, it is charging normally and the drain on the battery is less than 300 milliamps. They recommended turning the side-lights on during short trips (this will override the fuel-saving feature of the alternator to only charge the battery at the rate of 70%) and using a battery charger/maintainer to keep the charge topped up. I got the impression from them that it would be better to trickle-charge the battery, which I guess means using a battery charger with lower amps.

Would you recommend a “charge and maintain” battery charger and, if so, how many amps should it be? I have a 12V-48AH (55D23L) battery with a CCA rating of 390A. The car manual says not to use more than 10 amps when charging the battery because it will shorten battery life. Thanks.

Hi there,
Our battery service will be able to supply the charger to suit your requirements, or give advise where to find one if they can't help. I imagine you will need a maintanance charger.
Please phone teh battery department on 09 636 7350