I just got my Aspire Pegasus yesterday. I use an IGO-W3 with a duel coil, total of .5 ohms. I have a few different batteries - efest 2500mAh 3.7V 35A, Panasonic 3400mAh 3.7V, and unknown brand 2100mAh 3.7V that my local vape shop recommended. All the batteries are relatively new - efest about 2 months old, Panasonic about 2 months old, unknown is about 3 weeks old. The batteries will register as being fully charged when I first out them in, but I have had an issue with all 3 giving me a "low battery" message and not firing when the battery registers as being at about 3/4 full charge. Additionally, it only takes about maybe 40-50 hits for the batter to drain by 1/4. I have been playing with the wattage, 25-30 watts seems to give me a good hit so I have stayed in that range. I don't understand why the device drains the batteries so fast and will not fire when it registers a 3/4 full battery charge. I was previously using a K-100 mod and the batteries lasted a lot longer giving me the same kind of hit as the Pegasus at the 25-30 watt range. Please help!! Any ideas or suggestions are greatly appreciated.