The N70 gives the battery size and the ZZ in the position of the +ve & -ve poles.
The rest comes down to CCA, manufacturer, battery type, personal preference, colour etc.
My Defender, SI, SII, SIII and SIIa all use an N70ZZ. I tend to go for a calcium (sealed battery) from a battery supplier (not SuperCheap) and usually get 4-5 years on the Fender then the battery passes to a Series for a few years. Best was 8 years.
Because some of my vehicles don't get used I charge them every few months and use a battery isolator to ensure nothing drains them down (or the kids leave something switched on !).
Colin
'56 Series 1 with homemade welder
'65 Series IIa Dormobile
'70 SIIa GS
'76 SIII 88" (Isuzu C240)
'81 SIII FFR
'95 Defender Tanami
Motorcycles :-
Vincent Rapide, Panther M100, Norton BIG4, Electra & Navigator, Matchless G80C, Suzuki SV650
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