I have installed a 22 cell (92v) battery built by David Bissen and am having great success. While the setup is still very new, and the permanent installation is not finalized, I wanted to begin the documentation for other Think owners that may be interested in replacing their AGM and upgrading to a lithium battery setup. As a background, my old battery setup would allow me to go a couple of miles, which while fine to get to the beach and back, limited me to staying close to home. I wanted to be able to easily go 15 miles without worrying about the battery. I believe I have a lot more…
In terms of fit and finish, the battery pack easily fits in the stock location under the front seats. I am in the process of fabricating a battery tie down and will use the factory bolt holes. I will also likely add fans to the case, but so far this has not proven to be necessary. Currently I have sent my charger to Dave to reprogram the charger so I can get a full 92v charge. The charge profile I was using only took the cells to 84v, but that was a HUGE improvement over the AGM setup.
Acceleration feels faster (maybe less weight, maybe placebo), but the speed is still governed at 25 mph :(…The cart drives fine and I have been able to drive the cart into and around town and back without any issue (other than limited top speed). The furthest I have driven the cart is ~ 6+ miles and voltage dropped from ~83v to 80v.
Ideally, I could reprogram the controller to allow the cart to drive faster. Maybe I should consider changing the gear ratio so I can go a tad faster without spinning the motor too fast? While 35 mph would be nice, 45mph would be nicer :).
Pictures and updates to follow…
My next modification will be installing disc brakes…
