Reo grand is mechanical, so 4.2-3.7 volts depending on when I change my batts. I run a .8 ohm coil, so its roughly 22 watts on a fully charged battery.
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That is a high wattage at 22...I thought 20 watts was the high end...I never used anything less than 1.25 ohms...is that the reason why you go through so much juice?