hi, guys I am a newcomer.
when I jump-start my car, and I keep driving for about half an hour.
But when I turn off the car and want to start again. It fails .
So is that because the battery doesnot work or other problem?
should I change the battery?
please give me some advice.
thanks a lot

check if your alternator is charging properly, and if it is... check all the connections... and if they're good... see if you need a new battery...