This kit will make you mx350 or mx400 50% faster and yes the supplied 3rd battery fits inside the existing case so it looks stock, unless you have the brand new mx and then the battery sits on top as pictured below (last 4 pics showed it installed)..Pics show it installed and if you ad the speed reducer you can see it hidden up front also.

This kit comes with 1 hi end Duracell Ultra battery that we put in series with your existing 2 good batteries, if your batteries are not good it will draw this new one down so if you need 2 more then here is the item number for 2 more matching batteries  eBay item number:226101357883

  Please take note we have all the different throttles available pictured above, it comes standard with the throttle in main picture, if you want ANY other throttle you must send a note to seller at checkout and then slick 'AD" after you type it or it dont get sent with order..simply include the # in the picture of the throttle you see!  

100% Variable speed kit - no more on off, this kit allows you to have variable speed and do any speed with the twist of the throttle just like it should have came except much faster so be very very careful! 

                  Here you have a 36volt overvolt kit for the all the models of the mx350 and Mx400

 Its a really easy to install 36 volt kit that overvolts your existing motor to 36 volts to get gains of 50% or more!

 The kits pretty simple to install and comes with very detailed directions and everything needed to install it besides a few basic tools.

 We also sell headlight kits, brake and taillight kits, speed reducers to allow you to control the scooters top speed for younger riders.

Headlight kit ebay item #
222627137235


Speed Reducer
item # 222627137275



 

Brake or taillights (requires 2 kits if you want both) eBay item number # 223288548132

 The kit requires 3 good batteries and this kit only comes with 1 battery that my controller puts in series with your existing 2,perfect working, 12v batteries. If you want 3 new batteries simply buy the kit and request a battery refund of $16

 If your running lipo/lithium,drill batteries or whatever, the max output cant exceed 44 volts and the LVC is 31.5. and do not put 3 lifepo4 in series it wont work it will shut down under load due to too small of a bms in the battery..

The output is 500 watts unless you request 800 or 1000 watts which would be needed for a 500 watt motor swap or bigger.

 I give phone and text support as always and this has been tested and used for a while now and the gains are awesome!

Kit comes with----

36 volt 2.0 amp charger with a built in fan
36v 500 watt performance controller
1 12v 7AH Hi quality Duracell battery
1 Chrome DigiMax digital readout throttle with key- reads your "exact voltage" output and we can substitute for Red,Blue or the standard 5 led dummy light style with key that has silver top,5 led lights showing battery estimated life and black grips.
Matching Grip
Along with all the rest of the stuff pictured and very detailed directions so you wont have a issue.