Over the last few months, I've purchased 5 batteries. They area ll Ego 650mah, with the exception of one which is a 900mah. I have had trouble with them all. I am not sure at all if it is something I am doing, or if the problems is the batteries. I also bought two new chargers. Brand new, and fresh off the charger, they might work for 10 minutes, and then they flash as though they needed charging. Clicking them 5 times, off and then on, can sometimes stop this happening, but not all of the time. This does not happen consistently, now and then fresh off the charger, they work fine. The most disconcerting thing that happens, is that sometimes after I take a draw, the battery does not turn off. It stays on and fires until I can unscrew if from the boge carto, once I separate them the battery flashes 5 times, but does not turn off. When that happens, I am not able to click it 5 times off, it simply keeps flashing.That worries me quite a bit. I am looking to find out what the issue is, and what I can do about it. I am about at the end of my tether.