How long can an iPhone keep its charge?

I have an iPhone 4s and tomorrow I'm going a road trip with my parents and I'm expecting it to take about 4 hours. I wanna watch netflix on the way there and on the way I'll probably send a few texts. Can my iPhone run for 4 hours on Verizon 3G? If it can't then I guess ill bring my MacBook and charge it on the way up.

Bring a charger just in case, but it should last.

Yes it could do it but you gonna have to use earphone and put the display level on low and the network pishing 3g take up about 23 percent and netflix 60 percent. So maybe if netflix buffer once in a while.

The 4S was made to let it's battery last longer but to ensure that you keep yourself entertained for four hours you should bring your macbook along just in case.

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If you're watching movies I estimate your iPhone will last around 3-4 hours. Tips to save power if you find you're running low on battery and need to conserve it. Close the apps (not simply minimise) when you aren't using them by double tapping the home screen, holding it and hitting the minus at the top right corner. Also, keep a relatively low brightness, it's the major drainer of power. And if you do need to charge it, see if you or your parents have a car charger which plugs into the cigarette lighter (if your car has one). Have fun.

I would say less than 4 hours, the reason for that is because when i'm playing blood brothers on my wife's 4s. It barely lasts 4-5 hours. And its an online only game, so its constantly communicating with its servers. But imagine streaming movies constantly over 4 hours, thats going to run it down much much faster.

My iPhone will keep it's charge for 19-20 hours from fully charged

I turned off Wi-Fi
- Go to Settings
- Go to Wi-Fi
- Deselect the Wi-Fi option

I Turned off BluTooth
- Go to Settings
- Click on Blutooth
- Disable Blutooth

I dimmed the screen brightness:
- Go to Settings
- Go to Brightness & Wallpaper
- Turn the brightness down to 1/4 of the way

Turn off Auto Brightness:
- Go to Settings
- Go to Brightness & Wallpaper
- Turn off Auto Brightness

Set Mail to Sync Less Frequently:
- Go to Settings
- Go to Mail, Contacts, Calendars
- Go to Fetch New Data
* Turn off Push
- Select it to Fetch every hour
* you'll still be notified before the hour but it will be consuming less battery this way than having the mail sent straight to your phone as soon as it's received by your email provider*

Turn off GPS:
- Go to Settings
-Go to Privacy
- Go to Location Services, turn it off

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