I purchased the battery locally - from my local MB dealer. I researched the product online....no one will ship batteries these days. I looked on eBay - and at local car shops....granted I noticed that you could use an alternative AUX battery (one for a motor cycle) - however these would require you to 'drop' water within each to activate the acid component. These cost between $69-$93 - depending upon what model and make. In the end I decided to go with the OEM...
w211 2004 e500 wagon 4matic AUX battery replacement
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