FWIW, I have several Vortex Venoms and have not experienced this kind of battery failure. Most "problems" with Venom batteries have been resolved by tightening the battery cap. I typically turn on my Venom at the beginning of a match and off at the end, while I see other shooters turn their batteries off between stages. I usually shoot about 6 to 8 matches a month and change my battery every 6 months.
It will be interesting to do some testing with the new battery tester.