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July 16, 2009 1:35 PM PDT

Just Mobile Gum Pro powers, recharges iPhones

by David Martin

Are you an active iPhone user? Or a Twitter and e-mail addict? Does your iPhone battery never lasting as long as you would like it to? Want emergency backup power? Regardless of the circumstances, you need a battery pack.

Just Mobile's Gum Pro, which I tested this week, gives an iPhone a little more than two additional full charges. I have no complaints about it and I'll never leave the office without it.

The Gum Pro recharged my iPhone 3Gs 2.25 times.

(Credit: Just Mobile)

The Gum Pro offers some advantages that other battery extenders (such as the Mophie Juice Pack Air or the Energizer AP1500) do not. For starters, the Gum Pro is smaller, more compact, and offers a lot more battery for the buck at 4,400mAh and just 5.3 ounces. the Gum Pro charges via a standard Mini-USB port and a gauge that shows you the charge status of the Gum Pro--or, just watch for the charging screen on your iPhone to disappear once the Gum Pro empties. Recharging the Gum Pro takes approximately 3 hours.

In my tests, I started with my iPhone 3GS at 100 percent charge and waited until it showed about 20 percent of its own power left. I then attached the Gum Pro to my iPhone and let it charge to 100 percent again. I recharged my iPhone twice on a single Gum Pro charge. On the third charge, the Gum Pro charged the iPhone 3GS an additional 25 percent before throwing in the towel. The result: I got two extra days (plus some) of battery life with heavy iPhone 3GS use.

That extra time makes the Gum Pro the obvious choice for any active iPhone user. The $60 price tag--$20 less than the Mophie or Energizer--larger battery, and the fact that it is compatible with other devices (including iPods or any device that charges from a standard USB port) make it a superior backup charger.

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by gapfilmvideo July 17, 2009 8:17 AM PDT
sounds great! just curious how long it took the Gum Pro to re-charge the iphone?
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by David_W_Martin July 17, 2009 8:34 AM PDT
The Gum Pro did not charge the iPhone 3GS any faster than normal. While I did not time it exactly it certainly did not feel any longer than normal. The charge time for that phone using the regular A/C adapter or plugging it into a computer should be the same as the Gum Pro. Hope this helps!
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by July 18, 2009 11:09 AM PDT
David,
Where we you able to get this product? I've checked the company's website, and it doesn't seem they sell these directly anymore. Any reputable retailers you can point me toward?

Aaron
by filipiak July 17, 2009 11:44 AM PDT
I use the Lenmar PowerPort PPU2100B. It's only 2100mAh, but I got it for $30. It comes with tips for charging a number of devices via the USB port on the battery.
Reply to this comment
by Stryder541 July 24, 2009 10:45 PM PDT
The Lenmar website now says the PowerPort is NOT compatible with the 3GS.
by Maringuy August 4, 2009 12:44 PM PDT
David,

As you may know, Rick Broida just posted an article on the Merit Line 1,900Mah charger for $17.99. Do you think the more expensive Just Mobile item is worth the extra cost?
Reply to this comment
by 415Sam October 1, 2009 12:28 PM PDT
I purchased this directly from Macsense. The battery capacity is 4400mAh. This is enough to charge the iphone 3 or 4 times. I am using it with a iPhone 3G however it works with all iPhones from the 1st gen to the 3GS.

The pp-08 has come in handy so many times when I have been out and not been near a charger. Just keep it in the car or my backpack depending on where im at. It has worked great and never let me down. This product does exactly what it is supposed to do!

I ordered it directly from here:

http://store.macsensestore.com/pp-08.html
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