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Correct Battery For 73 2002Tii?


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I'm looking for the correct battery for a 73 2002tii

  • Is 55Ah the correct capacity?
  • Is the tii battery slightly smaller in size than the non-tii battery? If so, why?
  • Is there a suitable OPTIMA brand battery? If so, please advise as to part #.
  • Any additional info or recommendation is appreciated.


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I've been getting batteries at Walmart because of the warrantee, but Costco is also a good source. I've not tried Optima but I understand they are leak-proof, which is good. You need to be careful about keeping the front terminal away from the bulkhead. 

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I believe 26R is the correct type of battery.  Available most anywhere.


The thing to look for to be correct for all 2002s of that year, is the mounting lip ON THE END.  A lot of 26R batteries only have the lip on the sides.


The 73s came with a 2part metal clamp that ONLY fits on the end.  See pic attached.


To properly hold down the battery you need this clamp or a makeshift alternative.



73 Inka Tii #2762958

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That's interesting about the battery clamp--on the carbureted 73s, the clamp is on the side of the battery, facing the alternator.  I knew the battery holder was mounted lower on tii's but didn't know the clamp location was different.


Ya learn something new about these cars every day.



'69 Nevada sunroof-Wolfgang-bought new
'73 Sahara sunroof-Ludwig-since '78
'91 Brillantrot 318is sunroof-Georg Friederich 
Fiat Topolini (Benito & Luigi), Renault 4CVs (Anatole, Lucky Pierre, Brigette) & Kermit, the Bugeye Sprite

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Huh.  I guess because the brake booster is larger on the tii, that they altered the box.  I thought all the battery details were the same as well.


I ran a larger battery in my car for years before I went back to the 26R.  So much more space with the smaller battery, and with a good or rebuilt starter the smaller battery works just fine.



73 Inka Tii #2762958

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26R good to know, learned something new again.

Andrew Wilson
Vern- 1973 2002tii, https://www.bmw2002faq.com/blogs/blog/304-andrew-wilsons-vern-restoration/ 
Veronika- 1968 1600 Cabriolet, Athena- 1973 3.0 CSi,  Rodney- 1988 M5, The M3- 1997 M3,

The Unicorn- 2007 X3, Julia- 2007 Z4 Coupe, Ophelia- 2014 X3, Herman- 1914 KisselKar 4-40

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