Ok i just got my car from the body shop. they left the lights on one night i guess and the battery died.. then after tons of start and move start and move for a few weeks. so now it needs to jump and start since i havent let it run for more then 45 minutes at the very most.. so i decided to charge it with an old charger of ours... its real basic 6 or 12 volt and it has a meter on the front saying how many volts its using
now after about a minute it shuts off then 2 or 3 seconds it pops back on..
i can smell sulfer a little and i can hear a very mild bubbling and from chargin our forklifts at work im guessing this is normal
i have had this battery for a long time so it might need replaced but what causes it to keep turning off.
* i took it out of the car so i dont screw anything up

 

take it to autozone and have them run the test on it.
they will tell you if the battery is bad. it probably is.

 

If it's over 3 or 4 years old, it may be time to replace the battery. I know exactly what that smell is, sulfur dioxide (rotten eggs). One or more of the cells or plates have sulfated. Definitely time to replace the battery.