micro x tank help

[baggy]

i have just got the dragon micro tank
i need to know how long it should be charged for
when i charge it the light goes from green to red as it's plugged into charger
but it does not go back to green as it says it should in instructions
i have left it charge for about 15 minutes
even then the light just turned orange
it does work & lasts for about 20/25 minutes
but am i over/under charging the tank ?

anyone who knows anything else that i should know about these tanks please reply

[baggy]

I NEED HELP

don't just look, REPLY (i would do it for you)

also i want another tank which one should i get ?
i won't be doing battle with them i just like the off road abbility
& driving over bits is good too

come on lads help me out here