You might have a battery that is on it's way out. I have a 5s, flew 3 batteries this weekend and the 5s went down by maybe 10% - 15%.
BenDronePilot said:A better alternative to this is using a portable hand held battery charger that can accomplish this same purpose. I highly recommend this one. It works great has two ports with 2amp charging capabilities.
RAVPower PB07
http://www.newegg.com/Product/Product.a ... 000Y-00034
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