When I purchased my 1951 8N, in October, 2002, it came w/ the above battery, a Deka, model 901MF. The date code on the battery was April, 2000.
I'm not sure how the PO maintained the battery the first two years of it's life, but given the overall condition of the tractor when I purchased it, my bet is it sat unused most of the time.
I always run the N's to operating temp every 3 or 4 weeks if they haven't been used. To make sure the battery doesn't discharge, all the N's now have float chargers. (And that will extend the life of any battery because it stops them from discharging.)
I also keep everything "clean, bright & tight", use the braided strap & 00 gauge positive cables.
So, in addition to it being a well made battery, doing everything else right probably helped this battery to make it 8 years & 6 months!
It finally refused to turn the 1951 over in Sept 2008, so I replaced it w/ a new one. Another Deka, model 901MF; cost w/ exchange was $69.
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