The 2011’s are good to go if you change the charging algorithm, replace the MPC with a larger 50amp plug and replace the mini-20 amp fuse to a larger blade 20 amp. I bought a 2011 and after a few month the pins burnt on the charging plug. I sliced around the two burnt pins on the charger along with the other I mentioned above and no issues after. I did have to replace the batteries due to the charger boiling the batteries before I changed the algorithm. The Polaris forum has done smart guys on there that will help correct most problems.