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group 26 is pretty much it for fitting in an H battery box. the original was a group 1, and being an enclosed box, group 26 (indicated by the 26 in the WM #) is about the only 12v with the right dimensions, length width & height. for best fitment and performance, avoid multi-terminal/combo/universal models, as the extra terminals can interfere or make unwanted shorts when installed. as far as battery quality, there are only 3 battery manufacturers in the USA, and that means what you/we are getting from various brand labels could very well be made in the same factory. You still get what you pay for, you just have to be proactive to find the best value on the same product and paying more for a better warranty and knowledeable customer service usually is worth it. Hint: never say it's for a tractor, if the battery also fits auto applications. Order it by group size, and if you need to, find out what car it would be found in, so that you can get the longest warranty period. and never let a battery go dead and freeze, that voids any warranty it would have had. also, ask for a battery with the newest date code at purchase. as for CCA rating, if you research original CCA ratings in 6 or 12v applications, they are quite low, even compared to the economy line of batteries available today. better parts stores' catalogs usually show those ratings alongside those of suggested replacement batteries--even for farm equipment. frequent battery failure is never the battery. it's going to be very basic, such as a bad connection or bare wire, possibly a bad regulator. the first time a battery goes dead, especially a recent purchase, charge it then have it tested. if it passes, start diagnosing the electrical system.
if you have bolt-together battery cable ends, THROW THEM AWAY, they say "emergency repair" on the package for a reason. BTDT--didnt find that problem until after killing a pair of 6v in series when the new replacement batteries wouldn't even click the solenoid on our big diesel. also make sure your metal box cover is not making contact with the battery posts. if you see 2 circular rust spatter patterns (especially visible if the rest of the cover is painted at all) right where the posts are, it's making contact and draining the battery. another BTDT. if my hints do not apply to you, try testing for shorts and drains using methods others have posted now or in the archives -karl f ps if you are near st cloud mn maybe i can be of more assistance, as i work in an auto parts store with decent access to ag parts.
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