JD batteries are notorious for dying early, or leaking all over the place. Do a search here in the JD forum for the term "optima" to read lots of stories.
I believe my 4120 has the original battery - approx. 4 years. I suspect I'm overdue based on others' experience. Also had to put a quick fix rust removal/paint job on the box area as I too have had a leaky one.
I dont know about JD but my Kubota battery in a B7500 was still going strong when I traded it off after 8 years here in Missouri. Just made sure the water level was up, did not trickle charge in the winter. Not a lot of use in the winter, maybee every two weeks for an hour or two, most use in the spring summer, and fall. Never failed to crank and go.
I have an 07 3120 and am on my 3rd battery. All 3 of these have been JD batteries and don't seem to provide a very long lifespan.
Not sure if this applies but I have had a number of boats and always used Optima batteries and have never had 1 problem with them. They cost a bit more but I think the rule "you get what you pay for" applies very well to battery lifespans. Next time it will be a Optima for my tractor. :thumbsup:
Get a battery charger that will maintain it, kick on when needed, click off when fully charged.
Will a battery maintainer extend the life of a battery, don't know that answer.
But all the experts say yes, I am no expert but I do have 4 batteries on Battery Tenders or battery maintainers.
I sleep better at night knowing all my batteries are always fully charged.
Another exception here. I have a 2007 JD 3720 coming up on 4 yrs and still on the original battery. Turns the engine very well and starts in sub zero temperatures like we had just this week. Can't complain -- maybe just luck of the draw.
I guess I'm pretty lucky when it comes to batteries, I have a 1997 John deere 1070 that just had battery changed two years ago and have a 1999 GT235 garden tractor that still has original battery and still starts right up. The only thing that I do though is put little battery maintainers on them especially in the winter.
I spent 39 years with the phone company. They have a lot of batteries out in equipment huts and have done lots of research. Batteries last the longest when maintained at 100% charge. A really good battery maintainer will add to the life. Avoiding very high and very low temperatures helps as does reducing vibration.
The only real improvement in sealed lead acid batteries is the glass mats, between the plates, in the AGM batteries. They improve the internal resistance and keep material that is shed from the plates from dropping to to bottom where it can create a short.