A couple of months ago my wife changed phones and ended up with a Sharp FX. While shopping on Monoprice this week I decided to get her a backup battery that she could carry in her purse just in case she needed to charge her phone while out. She wasn’t having problems with the phone’s battery life, but I figured I’d get it and then she could decide if she’d use it (if she didn’t want it I’m sure I could have found other uses for it).

I purchased a Monoprice Micro USB Backup Battery Pack for Smart Phones, Cell Phones and Cameras (2800mAh) for $13.28. Just as with the flexible keyboard, if it turns out to be a piece of junk, well, we didn’t spend much on it but perhaps it will outperform its cost. Since we just started using it tonight I can’t state whether or not it’s any good but it is connected to her phone and appears to be charging it. The actual capacity and battery life are things that will only be demonstrated over time, so if I learn anything new I’ll add it to this post as an update.

Updated 09/14/2011: My wife has used the battery to charge her phone on at least two occasions. It seems to be working as expected.