Well, I hate to contradict information from othes, but I can tell you that I did, indeed, have a cell failure in a pack on my Venus II. I had two batteries on that plane, all was ok on take off, and I flew for about, oh, 12 minutes or so. When I landed, I checked the batteries with voltwatch.. one gave me a good reading, then when I switched over to the other battery, well, it was in the red.

I checked it with an ESV and I barely had 2 volts in a 6 volt pack. A cell failed in flight draining the battery almost completely. The only reason the plane continued to fly was because of the other battery.

CGr.