Ooooh another thought, whats the rate on "slow" charge on your charger? On mine 
its 2a. Group 49 batteries at 900-1100cca but that doesn't tell us the long 
term capacity. I'm gonna guess, based on size its around 100ah so with your 
charger assuming you only run down to 75% thats still 12.5 hours to recharge. 
Could be on slow charge you're not getting enough time to get a full charge in.

-Curt

Date: Wed, 17 Aug 2011 10:04:51 -0700
From: Alex Chamberlain <apchamberl...@gmail.com>
To: Mercedes Discussion List <mercedes@okiebenz.com>
Subject: Re: [MBZ] 603 filter change, cranking forever
Message-ID:
    <CABHyH=a9ts4GiQKNv-+3Lx=c_rerl2j5qxeaosywrxzwj6z...@mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1

On Wed, Aug 17, 2011 at 10:00 AM,  <buymbpa...@gmail.com> wrote:
> With a good battery you should be able to crank for at least 1 minute with no 
> slow down.
>
>


OK, I think this is a critical point then.  It can only crank for 15
seconds before slowing down significantly.  Defective battery?  (It's
brand new, NAPA's mid-priced line.)  Defective charger?  (I'll try one
of my Battery Tenders instead of the Schumacher.)  What else?

Alex


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