Hi DGCRAIG1, nice to see you again. You were right, I upgraded firmware and "Weak Battery" doesn't show anymore, my Battery Indicator is flashing instead. But all 'n all, as much as I vole all seven of my DNA200 devices, I'm very disappointed in DNA75. I have DX75 and VT75. I don't think it's Evolv's fault, I is the lack of a decent 26650 battery on the market today. I've tested MNKE IMR26650 3500mAh 35A, VapPower IMR26650 4200 mAh 40A (bool sh...t), Sony US26650VT 2600mAh 50A. I was able to get 30A and 75 Watts, but only for the first 5 -10 puffs. When my battery is 75% charged and below, the Battery indicator starts flashing and power goes down. I also noticed, that my board overheats quickly. My 75 Watt Escribe Battery Analyzer was so short, that I can show three of them on one screen: The best performance, I got from Sony US18650VTC5 and VTC6. 26650 batteries were nowhere near them. VapPover 4200 mAh gave me 0.558 Watt/hours (158.9 mAh usable capacity), Sony US26650VT 1.591 W/h (430 mAh usable), Sony US18650VTC5 2.292 W/h (619 mAh) and VapPower 5200 mAh could not reach 75 Watts and failed my test. Sony US26650VT was able to give me full 75 Watts, but not for long. Those are very sad numbers. IMHO. I'm going to try A123 LiFePo4 battery next. Has anyone tried these batteries? Will DNA75 even support such low Voltage? Or DNA75 with current batteries is really a 50 Watt device?