ORIGINAL: smokeyser
Just wanted to throw it out there... I'm a noob so maybe I still read the directions too much and worry about things I shouldn't worry about. But I think all battery chargers suggest that it's not good to leave batteries charging unattended. Especially if using a fast charger that's only going to take 15 - 20 minutes, isn't leaving it on for hours without watching a bad idea?
If it's set to the higher current rates- ABSOLUTELY. Just scroll back to the top of the thread and look at the battery in the picture. The longer a battery is connected to a high current charge it builds up heat. Eventually the battery is going to cook off, and if unattended it could easily start a fire.
Ken