iPhones, including the new i4s, are notorious for short battery life. You don't need to be a power user to run your phone down before the end of the day. If you are a power user, you are certainly going to need some kind of back up to get the most from your phone.
The neatest and most reliable way of extending battery life is to use an external battery.These can be small units that push onto the bottom of the iPhone.They can be the sort of separate device that will recharge your iPhone battery using a USB cable.Phone cases that include an external battery are also available.Each approach has advantages and disadvantages.The push on external batteries means you don't have the mess of cables to think about but they are low on extra capacity.The case with battery included is very neat and secure- but only if you want to use a case at all.The external batteries that use cables are more versatile and will power a lot more devices- like the iPad, iPod, many other smart phones and game consoles. It's not difficult to lose these, though!iPhone 4 Battery CasesNo Amazon products foundsplash O2 Lite Rechargeable Battery CaseIf you are looking for a case to protect your iPhone 4 or i4s and you want to boost battery life this is the perfect solution.
The 1700 mA (milliamps) of juice that the case stores is a lot smaller than the New Trent device below, but it does add up to several hours of talk time.
In practical terms for someone who uses their iPhone 4 a lot- for games, movies, with bluetooth and so on, this will mean the difference between getting through the day and a dead phone mid-afternoon!
The case is extraordinarily slim and best of all there is nothing extra to carry around, plug in, lose or leave at home!Mophie Juice Pack Air Case and Rechargeable Battery (Black, Verizon and AT&T iPhone 4)Amazon Price: $39.94List Price: $79.95Mophie Juice Pack Air Case for iPhone 4
If a rechargeable battery case appeals to you the Mophie Air case is also worth checking out. There is a choice of colors- red, white, yellow or black. It is also one of the most well fitting and stylish battery cases around. It is even certified by Apple as a compatible device- a rare, acknowledgement.
The 'soft touch' finish is appealing in the hand and, of course, there is full access to all ports. There is no need to remove the case for charging.
It can add around five hours of browsing on 3G networks or nine on Wi-Fi.
Works with AT&T and Verizon iPhone 4
New Trent IMP180 Astro Battery Case for IPHONE 4 and 4G
Some people would say I have saved the best case to last. Certainly the level of appreciation from buyers around the web is very high for the Astro. It has a discrete, ultra slim design and the renowned build quality and reliability of New Trent (who make the most powerful external batteries available, see below).
The inbuilt battery offers 1700 mA and it can be recharged around 500 times before you need think about a replacement.MiLi from PoweskinPowerSkin MiliPower skin offer a 1600mAh case, which adds only 18mm to the thickness of the phone. It offers an extra 360 hours standby time, 6 hours of 3G call or around 11 hours of WiFi Internet access. It is a neatly designed device and offers good protection.
It is not cheap though, retailing at $85 most places online.
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