Take seriously the camera manufacturer’s warning not to store your speedlight without removing your batteries first. I discovered last night that the batteries still inside my SB-600, which I had not used in three months, had corroded inside their compartment. The SB-600 is, as a result, all busted up. Oh, poo. And my own fault too, in a real and warranty-voiding sense. It’s some small consolation that an external flash is not a mission-critical camera accessory for me (otherwise it wouldn’t have been left unused for three months). For bounce flash purposes, I’ll probably replace it with the considerably cheaper, but much less capable, SB-400, which will be sufficient in much more cases, and more portable as well.