iPhone Battery Packs for the iPhone 4 are beginning to be a dime a dozen and we're here to help you pick the best battery bang for your buck. While the iPhone 4 isn't exactly a battery life light weight like its 3G and 3Gs brethren, the iPhone battery life extender is practically a must-buy accessory when it comes to everyone's favourite mobile device.

Battery sapping games and apps aside, the battery expander serves as an invaluable companion for the travelling businessman especially in situations where regular charging might not be a viable option. Additionally, with better iPhone 4 in built camera, the option for you (and myself especially) to rapidly drain already limited battery capacity iPhone with pictures and HD video recording is ever present. Here are some options:

Longest Life- FastMac's iPhone iV

With up to 24 hours TalkTime and 70 hours audio, FastMac's iPhone iV is no pushover. For a product that is made in Japan America, the iPhone iV is surprisingly innovative and choc a block with great features:

iPhone iV Special Features

• Dual Ports For synchronous charging for both iPhone and iV at the same. Simply insert your iV into an Apple dock.
• Additional USB port Charge another iPhone or Digital device- it's great when hotels are stingy with room power sockets.
• Built in Flash The additional LED serves as more than a flash light, it doubles as another high powered flash for your iPhone camera as well. Goodbye darkened out photos.

Form Factor Slim and long. Weight Light Pocket Friendliness 3/5 "Is that your iPhone battery or are you just happy to see me?" Get it from here

Best Looking - Mophie Juice Pack Air for iPhone 4

I'm not really sure if the Mophie Juice Pack is an external battery or protective case first. Its form fitting hard shell gives you a lot of protection but makes it one of the thicker battery packs on the market. In terms of design, the  juice pack air™ 2-tone metallic case is beautiful.

Juice Pack Special Features

• Acoustic Sound Enhancement The case acts as a virtual speaker box, redirecting sound from the bottom of the iPhone 4 to the front, resulting in a richer, fuller sound quality.
• Embedded electronics Though Singapore Telco users will find no antenna issues, the Mophie pack assures no signal interference with the iPhone 4 as a result of inbuilt electronics within the case.
• Smart Battery Technology instructs the iPhone to always drain the Juice Pack's battery first
• Charge and Sync Sync with iTunes without removing it from the juice pack air by using the included USB cable.
• Protection The form fit provides some resistance to knocks but drop it and the same hardcase will essentially allow the shock to travel through the case and into the phone.
• Up to additional 6 hours on 3G, up to 12 hours on 2G, of Talk Time. Up to additional 36 hours of Audio Playback

Form Factor Thick Weight Hefty Pocket Friendliness 2/5 "say hello to Mr. Double Crotch" Get it from here

The Slimmest- Philips Attachable Battery Pack DLM2260

If you wear suits like I do, the Philips Attachable Battery is a godsend. It's slim, unobtrusive and best of all, it doesn't need me to stick my iPhone in the damned thing. Light-weight, it provides up to double your battery capacity and is designed to charge your phone first before itself.

The design of the battery pack is an interesting and marks a departure from regular form factors that require you to slip your iPhone into the battery housing.

Philips Attachable Battery Pack Special Features

• The suction caps Since the iPhone doesn't slip into the case, secure attachment is possible via 8 suction caps. Additionally, you don't have to remove your favourite iPhone case while charging the iPhone.
• Compact and flexible Comfortably use your iPod or iPhone while the battery pack is attached and charging.
• Double battery capacity Talk, surf and enjoy the music and videos on your iPod or iPhone for nearly twice as long.
• Hidden power-indicator light Discreet and energy conscious, the hidden LED light appears with the push of a button rather than glow and keep you (me) up all night while it's charging.

Form Factor Slim Weight Light Pocket Friendliness 5/5 "Didn't we say it DOESN'T go into the pocket?"

The new Philips Attachable Battery Pack DLM2260 has a recommended retail price of SGD 79 and is available at all major electronics retailers island-wide.

Win A Philips Attachable Battery Pack DLM2260

Be the first 50 comments to tell us why or what drains your iPhone battery the quickest and stand a chance to win one of the two Philips iPhone battery packs