where abouts is the main tank area? also my question regarding the charging was more along the lines of the led charge indicator. mine starts solid, then flashes slowly, then flashes really fast. after all that it ends out flashing at a speed in between the 2 and flashes like that for hours and hours. i know slow means charging and fast means trickle chrging because it says so on the charger. i was just curious as to what the in between flashing was indicating. i did join the yahoo group also. lots of good info on there but i havent heard back yet.