Thanks for the great info! I will try securing the batteries in my flashlight better, but I'm leaning towards one of these Magicshine-alikes now!

How long can you get out of your 2x18650 ebay xml-t6 light on High, lopek?

Also - how easy is the charging system to use? I mean, do you have to be very careful not to overcharge or can you just plug it in overnight and not worry about it?