Depends on what it is being used in.
You do not charge a 7.2 volt battery with a 9.6 volt charger period unless you want to ruin the battery. You charge it with a 7.2 volt charger.
It takes about 6 hours to charge a 7.4 volt battery when using a 5 volt charge. For the best results try charging it over night.
With a charger specifically designed to charge this battery.
It takes between 8 and 12 hours to charge a 12 volt battery at 2 amps. The actual time will depending on how much charge is in the battery initially.
6 hours
As long as the ATV is wired 12 volt, not 6.
3 hours
No
Pull the tops of the battery off and pour sterilized water in he open ports. Then charge the battery as normal. If it doesn't hold the charge then you need to replace the battery.
No, you cannot charge an 8 volt battery with a 6 volt charger. The voltage of the charger must match the voltage of the battery.
approx 6hrs
Dead Battery. Are you sure your battery can maintain or hold a charge?