Razor 36 Volt 12 AH MX500 & MX650 Battery Pack Beiter DC Versions 1-7

all right here it is upgrading a large frame razor 36 volt dirt bike sx 500 mx 500 or mx 650 they're all the same dirt bikes on the inside same nickel cadmium batteries same computer the only difference with the 650 is a slightly larger motor which you can upgrade to on the 500s it's simple plug and play so i replaced the three nickel cadmium batteries with one lithium battery saved 18 pounds disconnected the red and black wire with the low temperature solder butt ends um to the red and uh black wires that came out of the computer module and then i wired the charging port to the outside of the plastic cover so that i could use the lithium charger i no longer use the stock charger for the razor i also went and upgraded to the 650 motor it did not give me much speed but it did increase the torque i then upgraded to a 13 sprocket on the front which increased the speed to 21 miles an hour b