:roflblack: Cautious is my middle name. It is good to know that you have done it successfully! I approached it from my experiences with motorcycles, which have somewhat smaller batteries and are not as forgiving. I thing Roger had the soundest advice...ask some questions about the problem, and approach it from there. If a catastrophic failure of the dead battery was suspected, or a voltage reading was extremely low (I do carry a multimeter), I would probably sugguest an alternative. If the battery was merely low (12-12.5 volts) I would probably go for it if jumper cables were available. If the situation ever presents itself, I expect that would be my guide. On the other hand, I would not ask someone to jump mine unless I was really desparate.