My recent battery purchase was for the '82 300D, (all use the same battery size). The original was a "N88". I was quoted $160 for a 2 year warranty Varta battery ,
or $70 for a cheap, locally produced one of the same specs, but with only a 3 month warranty.
Guess what I bought:
The $70 battery and a heavy set of jumper leads.
Either I will only get my 3 months and my gamble will be lost, or I will get more than a year, and I will have saved money. If it lasts 2 years, I have saved $90.
I do not count the cost of the jumper leads as they will never need replacement.

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Tony from West Oz.
Fatmobile 3 84 300D 295kkm Silver grey/Blue int. 2 tank WVO - Recipient of TurboDesel engine.
Josephine '82 300D 390kkm White/Palamino int.
Elizabeth '81 280E, sporting a '79 300D engine.
Lucille '87 W124 300D non-turbo 6 cylinder OM603, Pearl Grey with light grey interior


Various parts cars including 280E, 230C & 300D in various states of disassembly.