The power adapter is a bit inconvenient when you are on stage and already have guitar and headphones connected (at least that's what I'm planning to do). Unlike alakaline batteries, the voltage on a rechargeable drops more so before the current capacity expires, which for digital devices, may cause them to stop working sooner than with a Alkaline. I'd be willing to try rechargeables, as long as it won't damage the Pocket POD or void the warranty.