Just wanted to share a new item that I just received from smartpowercharge.com. It's called SPC4000. This thing is awesome! It charges 4 batteries at once. Has two USB chargers built in. It has a cooling fan built in, incase of overheating. It will also deep cycle charge your batteries. It is recommended to run your batteries down to 30 percent, then set the deep charge cycle. I think they still have about 50 left. It's a great price and extremely fast shipping. I highly recommend this if you fly a lot. They also have chargers for the P-3, P-4 and the Inspire1. I can't tell you of the longevity of this, due to the fact that I just received it. But I can tell you that it is well made. I think a lot of thought was put into the making of this charger. Here's a link to the site. SmartPowerCharge.com Site Product Detail Page