Now adays about 36 - 48 months is all you get from one.
if you mean shelf life they last for years if stored properly
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.
Stock battery is a 6-volt unit. check VW specialty shops for replacement.
This will depend on the size of the 12 v battery.
No set answer to that. Depends on the power rating of the motor and how hard you're running it.
A 9 volt battery is stronger than a 1.5 volt battery because it has a higher voltage. The higher voltage allows the 9 volt battery to power more demanding devices and last longer than a 1.5 volt battery.
The answer is going to depend on the size of the battery and what you are mowing. 12-volt batteries provide 30 - 40 minutes of mowing time; 24-volt mowers last 40 - 75 minutes; and 36-volt mowers run for up to 90 minutes. If your lawn is thick, lush or tall then the charge may not last as long.
Absolutely not! It is a 14 volt drill. Use a 16 or 18 volt battery will destroy the drill in short order. It will run but not for long.
3 hours
As long as the ATV is wired 12 volt, not 6.
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.
It depends upon the amp hours of the 6 volt battery. The higher the ampacity of the battery the longer it would take. I hope that this is a hypothetical question because why would one want to fry a battery.