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What external battery pack are you using?


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Hi guys. What external battery packs are you using? Can you please share your experience with it?
I have a big problem with the short battery life of my phone. I'm looking for an external battery pack and find tons of them, capacity from 2600mAh to 20000mAh and many at cheap price, when I go through Amazon and Ebay. I'm not sure about how fast will these battery packs charge. And it's hard to decide which to buy. Anyone can suggest?
For my phone and Android tablet I use a Trent IMP70D. Has 2 USB ports with 1.0 and 2.1A. For chargink uses MicroUSB which saves space as I do not need a spearate charger for the battery itself.

For non-USB charging you have to look at power monkey and the like.
Thank you guys!I finally purchased one of the RAVPower 14000mAh from Amazon as it was on promotion. I paid $37.99 after the provided coupon code. It just arrived at my mailbox. Looks great! I'm going to charge my phone with it.