The iPhone 3GS can have around 5-6 hours of constant use (screen lit up). There is an app i recommend which tell you an approximation on your battery life, how long you can do certain tasks and such. Its called "Battery LED."
Personally I like the IPhone 3g. They are a little big but efficient. If you are looking for a long battery length, the IPhone doesn't last very long on batteries.
Depends how you use it. Normal use required daily charge.
it last for 240 hrs on stand-by,means when the phone is on sleep mode.Also it last for 8 hrs on talk time 3g/3g
Depending on what app you use. Some apps take a lot of battery life to use others less. A battery life tip is to go into your settings and turn down the brightness. This will help the battery life last longer.
a car battery last for about 3-5 years
Depends upon usage and how many applications are open at the same time. The greater the use the less time it remains charged.
seven years
As long as the battery is kept charged then it should last 3-5 years.
a panasonic triple a battery last about 4 hours nonstop.
about a year.
8hrs