On the 68kmla forums, there is a thread about exploding Maxell PRAM batteries. Well, it can happen to other brands as well. Was dealing with an SE/30 that wouldn't boot, instead showing garbage on the screen. Finally, after three tries, I shut it down, and opened the case. Noticed the usual crud from a leaking capacitor on the underside of the board. Flipped the board over and was greeted with this:
Please, do yourselves a favor, and replace the batteries if they're 10 years old or older, or if you don't know when you last replaced it Even if it works at the moment.