You might want to investigate Fromeco as well. People who have used them swear by them & the prices seem to be a little more reasonable. I think in the coming year we are going to see a lot of improvement in both the quality & price of Lithium batteries for our planes. FMA is coming out with new systems, as are a number of other manufacturers. Multichargers & self balancing chargers are becoming available as well. Lithium is probably going to be the battery of the future.