[Mercedes] Portable battery charger

[dan penoff.com]

Then you’re going to need something like this:

<https://www.amazon.com/Schumacher-SC1308-Automatic-Advanced-Diagnostic/dp/B07897HX4W/ref=sr_1_8?th=1>
[A245B3AD-21D4-4C1D-9412-D19E7F740F47]
Schumacher Electric 6A Car Battery Charger and 100A Engine Starter, 6-in-1 Solution, Maintainer, 30A Boost, for 6V/12V Power Sport, Automotive, and Marine Batteries, SC1308<https://www.amazon.com/Schumacher-SC1308-Automatic-Advanced-Diagnostic/dp/B07897HX4W/ref=sr_1_8?th=1>
amazon.com<https://www.amazon.com/Schumacher-SC1308-Automatic-Advanced-Diagnostic/dp/B07897HX4W/ref=sr_1_8?th=1>

I've got an earlier model of this charger and I believe Floyd has one, too. I’m very pleased with it. The probalem you’ll run into if you have a parasitic draw is that a battery “maintainer” won’t be able to keep up, and after a while it will either shut off fro being overloaded or the battery will eventually die because it can’t keep up with the additional load.

I have this on the W211 and it gets plugged in whenever it’s parked. Keeps everything charged up and happy, and if it does die for whatever reason, like me forgetting to move the car into the garage and letting it sit out overnight, it will bring it up in a matter of minutes and get it started.

-D



On Dec 13, 2025, at 10:37 AM, Andrew Strasfogel <astrasfogel at gmail.com> wrote:

Jump start a dead battery.

On Sat, Dec 13, 2025 at 12:31 PM dan penoff.com<http://penoff.com/> via Mercedes <mercedes at okiebenz.com<mailto:mercedes at okiebenz.com>> wrote:
Depends on what you need - do you just need something to maintain the battery, or to do that *and* offset a drain/draw on it while sitting idle. It matters, I know all too well with the W211 “EV” I currently own.

-D

> On Dec 13, 2025, at 10:19 AM, Andrew Strasfogel via Mercedes <mercedes at okiebenz.com<mailto:mercedes at okiebenz.com>> 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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