The thing I want to know is how old is the battery? A lot of batteries have 2-3 year free replacements.

Before winter starts, take the battery out and take it to autozone or advance, etc. where they have the free battery testing and charging service. Make sure it works or replace it.

Trying to squeeze a little out of a battery is not good. It can leave you stranded and waiting for AAA, etc. Sitting in a car in 20 degree weather waiting for a jump is NOT my idea of fun.

BTW, Mercedes 1-800 number does offer free jumps and I have used this before like 10 years ago. Its free, but you still have to wait and I tip the tow truck driver.

Mercedes makes a BLACK battery that is gel filled and a lot like optimas. It fits perfectly, looks nice, etc. but also has a heavy price tag. I have been using one for 2 years and it does work great.

There are smart battery chargers you can buy that desulfates the battery and trickle charges it, etc. For a good quality one, expect to pay $100 maybe more.

They kind of work, but kind of dont, it depends on how wore out the battery is, don't beleive the marketing and hype that you can "revive all old batteries", etc. for me, it only worked on 1 out of 4 junk batteries I had. Then the smart charger broke and I had to return it, lol.

They do make stuff that you can pour into a old battery and it supposedly desulfates it and revives it, BUT on the Mercedes black batteries, there is a label that clearly tells you not to remove the caps ever and you cannot remove the caps without breaking the label. so much for that idea....

But I agree with tango. Batteries are cheap and easy to replace compared to starters or alternators.