Question about trickle charger.

[trackerxx99]

What's the best practice to use a trickle charger? I have a E46 and a E53. When using one I don't use the other sometimes for 2 weeks at a time. When I start the cars after a while the battery seems low as if it has been draining. Is there a battery charger that works for both. I am also interested in using a solar charger if possible. Thanks for your help.

[ben4bama]

What's the best practice to use a trickle charger? I have a E46 and a E53. When using one I don't use the other sometimes for 2 weeks at a time. When I start the cars after a while the battery seems low as if it has been draining. Is there a battery charger that works for both. I am also interested in using a solar charger if possible. Thanks for your help.

I use the BMW trickle charger and bought it off amazon for cheap. I charge if car isn't driven for 3 or 4 days. Nothing kills battery life more than decharging it over and over

[Kevlar]

BMW electronics pull alot even when it sleep mode ... I want to say the 7er user manual says if you plan to park the car for more than a couple of days a charger is required. IE, don't park it at the airport for more than a day or two if you plan to drive it home.

[Wilson740]

BMW electronics pull alot even when it sleep mode ... I want to say the 7er user manual says if you plan to park the car for more than a couple of days a charger is required. IE, don't park it at the airport for more than a day or two if you plan to drive it home.

Actually the older cars have a higher amperage draw. The E series cars range from 40 to 50 milliamps and F and G series 9 to 22 milliamps. You can use a trickle charger. You must hook up to the power terminals under the hood if you have a E90 or newer vehicle if it has a IBS sensor on the batteries negative terminal. I have seen a solar charger used on some models that plug into the obd2 plug.