I am not keeping my dvd batteries in the fridge... no way in @$%^
You're absolutely right though, Gutbucket. Using a Tekkeon (specifically those with the voltage auto-detect functionality) is a recipe for disaster.
However, we've been using decent 9v DVD batteries since our first unit in March and have never had a problem. Flawless operation everytime.
I also use a 12v SLA sometimes which works perfectly. It definitely makes me feel a lot better knowing the clean power SLA's provide, but it's only 4.2Ah and can't power both my AD2k+ and the 680 for more than 3 hours. For longer shows, I still use a dvd battery.