When i plug the scooter i the lights show green but it doesnot keep it charger whay is wrong

First, I would clean the connections with the eraser of a pencil. Just rub the metal connections, try to get as much surface as you can.
USUALLY, its the lights themselves as long as you can charge. But, Im thinking you dropped it, and Id recommend you get a new charger. Another thing to try is get a voltage tester. But more than likely, get a new one. If you did drop it, the voltage regulation will be inbalanced and can cause a fire. As I do not know the make model of your scooter, check Amazon for the voltage and amps of the SAME brand of charger as your scooter.

The battery needs to be tested, if that is ok have the battery charging system tested.

The green light will come on if the charger does not sense a low battery. In other words, if you plug it into the wall, and not the scooter, it will still show the green light. It will only show a low charge (and charge the battery) if it is completely connected completing the circuit. My guess is that the battery is dead, and the plug is not all the way connected. Also, I believe the scooter has to be turned off to charge.

First measure the voltage of the batteries at the charging socket of the joystick.

I'm afraid your batteries have expired. They will show full voltage but the Amps are not being replenished.

How old is the battery? Most are only good for three years........
Mike

make sure battery cables are secure at battery terminals and clean.how old are the batteries.If the batteries run down fast they are no good.a good way to test them is put scooter against some thing solid and go forward.If the battery indicator drops to o the batteries are no good.It takes about 10 hours to charge the batteries

Is there a power switch on the charger? Is charger connected to the battery? Are the batteries fully charged?

Has the scooter been stored unused for a while? If so, the batteries may have gone solid from improper maintenance. There is a gel inside the batteries that needs to have current run through it at least once a week to keep them fluid. The charger is showing a green light because it senses the batteries are full, but instead of being full of power, they are full of crud and need to be replaced again. If the batteries have been properly charged but you still cannot get power, check all your connections to make sure they are tight and that your fuses are not blown.
Good luck!

The rechargeable batteries are no good or a connection in the battery holder is loose.