I know this is an older thread, but felt I needed to chime in. My experience with strongbox batteries is not so good lately. I had decent luck with a strongbox battery I put in my jd3032e. I had taken out the original battery that was 5 or 6 years old, the new strongbox was good when I sold the tractor two years later. Then in 2016 I bought a used 2005 jd3320, and the the original strongbox was still in it. Needless to say, as it got cold I had to put a new one in it. Went to jd in fall of 16' and bought the 500cca strongbox. I struggled all winter with that battery hard starting and jumping it at times of severe cold. Made it through the summer and by fall of 17' I needed a new battery again. It was right at the year warranty and jd ended up giving me a new battery. The tractor never started so good after that, so I figured the previous battery all along was not good. Fast forward to one month ago, this battery started doing the same thing, slow cranking etc. having to jump it. I went out tonight after running the tractor on Saturday for an hour at high rpm, slow crank dead after 2 seconds of cranking. Jumped it and fired right up. I have even put a battery tender on it this winter when it was really cold. This strongbox battery only lasted one year and four months. That is pathetic. Whats more pathetic is the warranty changed from pro rated for 3 or 4 years to a 1 year replacement. That tells me they changed suppliers or something. They certainly don't last like the old ones. Not sure what I'm going to do now. Is there a different brand replacement battery that fits without modification? Sorry this got so long.