I bought two of these for my Futaba 4PLS conntrollers. It fits great. I've been using it for about 2 weeks and have yet to recharge it (beyond the original charge.) I would say I've used it 3-4 hours so far and its still showing 6.7v (it read 7.3v when fully charged) on the display. I don't know exactly how long it will last between charges, but it has already surpassed my expectations. It would be nice if it came with a Deans connector rather than two receiver connectors; Just for ease of charging. But that is just preference, and easily fixed.