I purschased the SKYWIN portable charger and it arrived this morning. It came already nearly fully charged so after about 45 minutes it was ready to go. I’m only using 4 batteries at this time until the 5th shows up. So I went to Lock and Dam #7 on the Mississippi River close to my home to do some flying. Fighting substantial winds on the river, the batteries were draining pretty fast. I rotated them through the charger as I went and I have to say that this charger did an excellent job. I think that on a calm day, and without having to use sport mode to get back home so often, it would have kept right up without much, if any lag. I cycled a total of 5 full charges through it and when I left it still had 2 of 4 dots showing. The charger itself seems to be built very well. Still early, but very pleased with this purchase. 
