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Hi everyone! We've had the quad for several years since new and the original batteries finally died. In the final months I came across the various electric scooter forums and learned about all the fun things that can be done to them. We were also thinking of adding the reverse function to it and it seemed like the perfect time to do the upgrade. On the mechanical side I replaced the original rear axle 47-tooth sprocket with the 54-tooth version for a bit more torque. Replaced the two original 12V 7AH batteries with three 12V 10AH. I found that these are the largest batteries that can fit without frame modifications (other than the mount of course) and not be in the way of the front wheels at full lock. The original controller got replaced by SPD-36500R controller with reverse function. http://www.electricscooterparts.com/hookup/SPD-36500R.htm I went with Trail Tech 040-HBS-01 switch to control the reverse function and Trail Tech 040-HBS-05 to control the three speed settings that the controller supports. Yesterday I finally wired everything together for a quick test, everything seems to work great. One problem that I came across and I need help with is battery charging. The controller does not have a dedicated set of leads for the charger and the instructions don't mention how the charging is to be performed. Do I just wire the charger socket directly to the batteries in parallel with the controller? If yes, do I need to unplug the controller each time I need to charge the batteries? Thanks!