I just picked up a TFV4 (the full size kit). I'm using it on an iStick TC60W. Right now, I'm using the the TF-T3 triple coil head at .22 ohms. It takes all 60 watts to get a good vape, which I knew before I bought the tank. I plan to get a 200 watt box mod soon. Until I do, an I okay using the batteries I have with this tank? I might go to the RBA head after this first tank of juice because the guy at the shop said I could run it around 20-30 watts. I'll put the specs of my batteries below. Thanks in advance for any help. One of the batteries is an Efest IMR 18650 3.7v 3,000 mAh and says 35A discharge current. The next is LG Rechargeable 18650-HG2 3000mAh Batteries Size: 18650 (18mm diameter / 65mm length) Type: Li-Mn/Li-ion / Hybrid IMR Rated Capacity: 3000mAh (High Drain) Part Nr: LGDBHG21865 Full charge Voltage: 4.2V Rechargeable: Yes Style: Flat Top Maximum Discharge (pulse): 20A Storage Voltage: 3.6V Charging Voltage: 4.2V Diameter: 18.0 +/- 0.5mm Height: 65.0 +/- 0.5mm Last, I couldn't find specs for this one, but I believe it is a Samsung. It has J5F8 48Q41 printed on it and M9E5 in another place. And a sticker that reads IMR 18650 2500 mAh 3.7v but I don't see a discharge current anywhere.