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battery charging question

Discussion in 'E36 (1992-1999)' started by 3toM, Jan 24, 2013.

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    3toM

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    I have a 1995 325i convertible that gets part time use. It sometimes sits and the battery starts to wear down. Over Christmas I received a solar panel trickle charger for the car. It can plug into the cigarette lighter of the car to keep up the battery charge. Will this mechanism work in this car? I am wondering if the battery will receive charge when the power is off in the car, or will the circuit to the lighter only function with the car operating?
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    MGarrison

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    Plug something in when the car is parked with no key in the ignition and see if it gets power.

    Was it one of these?

    http://batterytender.com/5-watt-solar-panel.html

    I don't know all the ins/outs of battery charging or how a battery gets overcharged, but from their product description it would appear some means of not overcharging the battery is significant.
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    Satch SoSoCalifortified

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    Until about 2007, most, if not all, BMWs had live doob-lighter circuits even when the key was off. That's why I have to manually turn off the Valentine 1 when I park. It's also why the Battery Tender works by plugging it into the lighter socket. The Battery Tender, for one, is a "smart" charger; it will not overcharge the battery.
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    3toM

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    Yes - the one I received looks very similar. I'll have to plug something in and see if it gets power. Thanks!
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    3toM

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    I'll take a look and see. The one I have also will not overcharge the battery. If it doesn't get power, I wonder if there is a work-around for that?
    • Member

    MGarrison

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    Plug your charger into this:
    http://batterytender.com/products/accessories/female-cigarette-adapter.html

    Connect that to either of these which you can connect to your battery:

    http://batterytender.com/products/accessories/ring-terminal-harness.html
    http://batterytender.com/products/accessories/alligator-clips.html

    Coming from one place, I assume these all would have compatible connectors.

    If yours won't overcharge the battery, then you won't need one of these:
    http://batterytender.com/products/accessories/battery-tender-solar-controller.html

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