[Mercedes] Portable battery charger

[Allan Streib]

If you want a "maintenance" charger the Battery Minder is a popular one.

https://www.northerntool.com/products/batteryminder-plus-battery-charger-trickle-charger-desulfator-12-volt-1-amp-model-12117tc-167981

Beware of counterfeits sold on Amazon.

If you have a current drain and just want to maintain/recover the battery until you can resolve that issue, disconnect the battery negative cable and then use the Battery Minder to recharge/recover the battery.

Not sure what to recommend as a traditional charger. I have a very old Sears brand charger that appears to be little more than a transformer in a stamped steel enclosure. Charge until the current draw indicated on the meter drops.


On Sat, Dec 13, 2025, at 12:19, Andrew Strasfogel via Mercedes wrote:
> My '85 300SD has a battery drain and/or faulty alternator and is currently
> DOA.  A while back someone posted links to inexpensive home battery
> chargers - would appreciate a repost.
>
> Andrew
> 300SD Cabernet red
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