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There's this thread, which I contributed to a few months ago: I replaced my Discovery batteries with four ReLion Insight 48V batteries, which have the same form factor as the old batteries. I went with them because of that, but mostly because each battery has a max continuous output of 100A, so the four of them combined can match the full 400A capability of the motor. Also their tech support was great and sent me the new charging profile and instructions so I could flash the existing onboard charger to change it over to their custom lithium battery charging profile. The fact that you can still see 400A with your original batteries is interesting, since I was never able to see that and was at the point of the UTV slowing down and throwing error codes when hauling uphill. The upgrade isn't cheap, so you may want to make sure you're at the point where you just can't squeeze out anything more from your old batteries. That said, the performance improvement is great. Four batteries is plenty of capacity for my use, but if you require maximum range (and don't mind the cost) you can actually parallel 8 of them and still save almost half the weight compared to the Discovery batteries.

Roger - Inability to properly shift into both Forward and Reverse is a common problem with this unit. You get one or the other along with gear grinding. It is what appears to be a design flaw with the Coleman UTV400. Another thread exists on this board describing it. Two fixes so far: DIY an extension to the shift handle to increase the throw distance or wait for Coleman to supply a fix-it-kit to your Warranty Service Shop and get it done there. In my case? Still waiting. However, we've been able to mostly make things work. On our Coleman UTV400, Forward works fine with an occasional gear grind starting out. Reverse was and is a better-pay-attention issue. We found that rather than slamming the gear shift all the way to the bottom of its throw, stop approx. halfways between Neutral and full bottom. With a hand on the shifter and fluttering the gas pedal, we've found that usually we can feel the shifter (and transmission) settle into Reverse. Until a real fix happens, we don't put ourselves in any MustBackOut situations. Regards, Ted in OK