The iPhone will typically go around 3 days between battery charges. This time may go up or down depending on how much you use your iPhone.
Heavy users may have to recharge every day.
You'll need a power adapter to charge your iPhone away from your computer. Normally this is done via USB but you're not always going to be around your computer.
It's a good idea to buy one or two chargers to keep you running.
Car chargers are also available. Have a browse of car chargers below...
Box Only For iPhone 4s (16GB) WHITE + USB Wall Charger GENUINE
LOT of 5 10 Foot Long OEM Compatible Charger Cables for iPhone iPod
iphone 6 plus 16gb gold box and chargerheadset
Poweradd 7200mAh Silicon Solar Panel Charger Battery Power Bank For iPhone 6 5S
3500mAh for iPhone 6 Power External Backup Charger Battery with leather Cover
Gold 20000mAh Slim Portable External Battery Charger Power Bank For Cell Phones
Pink 20000mAh Slim Portable External Battery Charger Power Bank For Cell Phones
IPhone5 2600mAh USB External Battery Power Bank Cell Phone Charger w Headset
USB Battery Charger Galaxy Note Tab Nexus HTC LG MOTO iPhone
Belkin 10W Wall Charger for Samsung Galaxy Note Tab for iPad iPhone LG New
Silver 20000mAh Slim External Battery Charger Power Bank For Cell Phones
Lot of 4 x 100OEM Lightning USB Data Sync Charger for iPhone66plus 5 5S