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it lasts at a max of 2 minutes 30 seconds.
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Defintely make sure you have brand new, fresh batteries in the controller. This is almost always the reason for short runtimes. If you are still getting less than 4-5minutes with the stock motor and gear setup, try a double charge and see what happens. Just charge as usual, then pop the car off the charging dock and then pop it back on again for a second charge.
Also try different motors in the chassis to see if the motor in there is flawed in some way and drawing to much juice.