- Size (LWH): 2.76 inches, 2.05 inches, 0.87 inches
- Weight: 5.28 ounces
Just Mobile Gum Pro 4400mAh External Battery for Portable Devices
We don't know when or if this item will be back in stock.
- Recharge your electronic devices anywhere
- ON/OFF switch for power saving
- Input (Mini USB): 5VDC 500mA Min; output (USB Type A Port): 5VDC 1000mA
- LED indicators for remaining power
- Easy to carry, easy to use
Top Customer Reviews
It can also charge any mini-usb mp3 player or device with the included cable (usb to mini-usb) that it comes with (same cable that it charges with.) It does not come with an iphone / ipod cable.
Since it is so small and light, I find this a much better solution than having a one piece battery pack always attached to the iphone, making the iphone uncomfortably bulky during use. I much prefer to keep the Gum Pro and a cable in my pocket to charge or use only when needed. Of course on a plane or in the car, just stow it on your lap or in the seat pocket.
Can't beat the $60 price for the power and convenience. For $7.60 expedited shipping, Amazon vendor Macsense had it from California to my mailbox in Connecticut 3 days after I ordered it.
I couldn't be happier with this.
The only negative comment I have is that the detents for the on/off switch are weak/nonexistent, so the battery pack can turn itself on/off by accident. I suspect the switch on mine is defective in terms of the 'clicking' on and off, but the actual switching of electricity works fine. Not worth sending it off to get it replaced unless the electrical switch itself fails.
Overall, I've been very pleased with the Gum Pro. It's super-high capacity, and yet compact.
I also discovered this charger works just fine for the iPad. The iPad is sensitive to USB power sources, normally needing 10W to start charging (some laptop USB ports and standard iPod/iPhone chargers won't work, for example). I'm pleased to say this charger packs plenty of punch, and the iPad goes into charge mode as soon as you plug it in.
It's been noted by other reviewers the on/off switch for the charger can be accidentally activated when it's in a carry bag or purse. This is very true, I've had the same problem. I solved it by keeping the charger (and its cords) in a small "zip lock" style bag before putting it into the carry bag. This protects the switch from being bumped by other objects and has resulted in zero accidental activations in the several months I've had it in my "man purse."
Most Recent Customer Reviews
I've had the product for years and they probably don't offer this particular product anymore. That being said, this review may help with anyone interested in this brand. Read morePublished on January 25, 2014 by Arnell
A friend from Germany once told me of the Gum Pro and that he personally thought it was the best external battery on the market. Read morePublished on March 7, 2013 by jens_camps
Tried another battery first but it didn't cut it. This battery can give my phone a couple of charges and stay stored for a while fully charged. Read morePublished on March 5, 2013 by A. Evegan
Second one is starting to exhibit same prob as first one (which died) and similar to what other longer-than-new users have posted. Read morePublished on January 23, 2013 by REO
I purchased the Just Mobile Gum Pro right after Hurricane Sandy and I wish I had it earlier! I am now on the 4th charge of my ipod touch. Read morePublished on November 18, 2012 by Linda
This battery has worked for me and many others who have borrowed it from me for over 2 years. It's a great value. Read morePublished on October 19, 2012 by Laura Harmon
I had to return one of these because after 18 hours it had not charged at all. The replacement does charge, but it takes HOURS to charge, at least 4 hours. Read morePublished on May 7, 2012 by Mary
I'll start with the bad part. The Gum Pro 4400 is so small and convenient, my wife lost it and I had to buy another. Maybe that's my wife's fault. Read morePublished on February 14, 2012 by foo monkey
When I first got this, I was so excited to try it. It worked great the first time. Charged my iphone really fast. Read morePublished on February 5, 2012 by Jeannie