I picked up a service manual for the Sony 505, it it looks to be about a 15-minute job to replace the battery. Perhaps daunting for some folks, but if you've ever opened your computer tower and replaced a card, or changed a battery in a portable house phone, it's just a step or two beyond that. The battery itself is a simple plug-in. The difficulties are the few screws holding the top down and the case onto the back. Knowing how often companies stop supporting products, I bought a replacement battery to have on hand just in case. Not so expensive, and a bit of peace of mind knowing that this won't get to be a problem for me. Not like changing a battery in a flashlight, but not rocket science either.