Your iPhone already comes with a decent battery inside. It will last you for hours per charge. If you need your phone to run for longer when you are on the road, getting a battery extender for it is a good idea. A decent battery extender can keep your device running for longer and could even get you unstuck in emergency situations. These 5 iPhone 5 batteries could come handy when you are traveling:
New Trent iTorch IMP52D 5200mAh External Battery Charger: this is compatible with iPhones, iPods, and Android devices. Its 5200mAh can be charged 500 times.
RAVPower Dynamo-On-the-Go External Battery Charger: this battery extender has a 5600mAh battery inside. It is compact and portable.
Anker Astro3 10000mAh battery: this battery has a 10000mAh battery inside. It can charge your phone 4 to 5 times. It is portable and offers 500+ recharge cycles.
Lenmar Meridian iPhone 5 Case: another case that protects your device and adds to its battery life. It comes with a 2200mAh Lithium Polymer and doubles your talk, text, and surf time.
i-Blason PowerSlate iPhone 5 Rechargeable Battery Case: this case not only protects the back of your phone but also comes with a 2200mAh battery. It is made specifically for the new iPhone 5. The product has some issues but does work.
These battery extenders are portable and let you use your iPhone for longer. Great to have during emergencies and on the road.