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@Butters
The eGo-T is rated at 3.7, but actually puts out more like 3.4 under load. To work out the wattage you'll get, divide the voltage squared by the resistance.
1.8
(3.4 x 3.4) / 1.8 = 6.42 watts
2.2
(3.4 x 3.4) / 2.2 = 5.20 watts
It's personal preference and all that, but I always found I wanted more from an eGo-T and the only way to do this is to use lower resistance coils. Once the original coils were dead, I would build my own at about 1.5 ohms, giving a bit more kick at the expense of battery life.