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We have fallen in love with these LiPo to USB chargers. Turn any LiPo into a USB battery backup in a pinch.

Jason Uberig's profile photoOlivier C's profile photoScott Elder's profile photoKriss Femmpaws's profile photo
Buying it. Thanks for the heads up. 
Why don't you see if you can get them for the Flitetest store? 
It is nice that it has the voltage readout; however, it does not say anything about a protection circuit to prevent over draining the battery. Maybe if they had combined a voltage alarm it would have been a safer device.

I suggest not leaving this one unattended. :)
The amazon one I don't know. The Hobbyking various devices, almost all they have a protection for 3S batteries. Since it probably cuts somewhere between 9 and 10V, it should be high enough to also protect a 4S.
I have one from eBay... works good - about 2a charge rate. Only issue is that it can drain a lipo with no notification of low-voltage. 2s to 6s .. worth the $6.36, I paid for it.
The no low voltage protection just means you have to keep an eye on it. I'm picking up three of them off eBay so I can use straight off a car battery with a pigtail.
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