In case no one noticed, the battery on the 3G S could be better. While it does seem to be lasting longer for me after a breaking-in period, it still is hard for me to make it through the day without rationing how much I use it or recharging through the day.
I got the Just Mobile Gum Pro from Amazon along with two extra iPhone charging cables for around $75 total with shipping. It retails for about $60.
The packaging was only notable for the picture of this guy. It was really strange and I got a laugh from him.

The battery pack is about the size of a pager or a large pack of chewing gum (think , and relatively heavy. That being said, once you connect it to the phone, you can put it in your pocket and not really notice it. There is an On/Off switch used for switching between the charging of the battery pack and charging of the phone, three LEDs that tell you the approximate charge of the Gum Pro, and two places to plug in various cables. There is the standard female USB port, and a female mini-USB port for charging the unit.


Here are the notes that I took while using the Gum Pro-
First charge of the Gum Pro-
8/10-2.10-4.30 USB from computer
4.40-5.15 charged from Apple wall charger
8/10-10.30 pm plugged phone in with 23% left 12.00am 100% charged
8/12-11.05pm plugged phone in with 29% left
8/13- 3.01am plugged phone in with 29% left
Second Gum Pro Charge-
8/14- 6:50pm plugged phone in with 33% left 100% by 8:30
8/15 1:00am plugged in with 23% left 100% by 3:00am
8/17 2.22pm plugged in with 31% left
So for the first charge, I got about 2.2 full charges from the Gum Pro, while I got about 2.1 full charges. Both times, the battery was drained to under 5% judging by the fact that no LEDs were lit on the battery pack. I should be getting closer to 4 charges, but it is important to remember that modern batteries need a break-in period. Overall, I got 3 extra days of charge of 6 hour/day usage. I didn’t plug the phone into anything except the Gum Pro for a week while charging the battery pack once.
Overall, if you are a heavy user of your phone or just want the extra juice I would recommend this unequivocally. It has a much larger capacity than all battery/case combinations and I have only found one battery pack that stores more than 4400mAh. Personally, I won’t be using it everyday but it will be great for flights, subway trips, and any sort of travel where you can sit down for a while. If you need something to charge on the go I would go with something along the lines of the Mophie Juice Pack Air, because the Gum Pro does not really lend itself to being carried around in the pocket while walking around because of the need for an extra cable. Public transport commuters, frequent fliers, and people who have access to electricity only rarely should pick this up immediately!








