I bought a used AD2K here a little while back that came with the EcoCharge 12v battery and I've had a wierd problem with 2 out of the 3 times I've used it so far...I always re-charge the battery after every use and will top it off again before I use it if it's been a little while since it's last use. Anyway, the first time I used it and again last night I've had the same problem (the second time I used it I had no problem) - when I first plug the AD2K in and turn it on, the low battery light on the AD2K is on and stays on for 5-10 minutes before the light goes out and the unit works fine. Of course the first time I used it I was alarmed (it hadn't done this when I messed with it at my house when I first got it) and wondered if I hadn't charged it or the battery was old and lost it's charge easily but then after 5-10 minutes of head scratching the light went out and all was well for the night. The same thing happened again last night. Any ideas why this happens? At this point I'm inclined to set up my gear and ingore it, assuming the light will go off after a little while but of course I don't want any surprises such as the day it doesn't go off or the unit dies 20 minutes into a show...