Here's a message that's worth repeating: MAKE SURE YOU USE THE PROPER POWER SUPPLY WITH YOUR PEDALS!
A customer recently sent us a pedal for repair, and the cause of the problem was pretty easy to figure out. We've seen the damage that can be caused from not using the proper power supply, but this one was a doozy! The entire bottom of the 9V battery was blown out. We've never seen anything quite like it, so we just had to show you.
Upon examination, it appears that a 9V battery (or at least a Duracell alkaline battery) contains six AAA-sized 1.5V batteries inside. Who knew? Just another random bit of stompbox trivia, courtesy of the FMO Gear Shop.