I usually vape at less than 20 watts with an adjustable temperature, so using the K4 definitely took some getting used to, but it really is a fantastic system. If you love big vapor clouds, this one's for you. It's taller than the eleaf Pico I've been using, but it fits nicely in one's hand and it is well built. I haven't tested the full duration of the battery, which is in itself a beautiful thing, since I use it all day without draining it and plug it in at night. The one thing I discovered after purchasing the k4 is that it is designed specifically for a 0.27 ohm coil. I have read several places that it doesn't work as well with the 0.4 ohm coil (which is what I normally use). If you read this Aspire forum page, it says use only 0.27 ohm coils: http://forums.aspirecig.com/discussion/27750/aspire-new-product-release-aspire-k4-quick-start-kit
One person's answer for why the 0.4 ohm coil doesn't work as well (i.e. it works, but flavor and performance aren't as good):
"Power = Voltage squared divided by resistance (P = E^2 / R or E = sqrt(P * R))
The Cleito 0.4Ω coil is designed for 4 - 4.9 volt sources
The K4 coil is designed for 3.3 to 3.9 volt sources
The K4 battery is not adjustable, and is probably a lithium ion cell with protective and charging circuitry to yield the proper voltage for the the K4 coil. This voltage is too low for the (other) Cleito coils."
"... batteries have an internal resistance. K4 current with a fully charged battery is roughly 15A. A 0.03Ω internal resistance would drop the voltage to the coil by 0.45V to 3.75V. With the 0.4Ω Cleito coil the voltage drop would be 0.3V, for 3.9V at the coil for a fully charged battery. With the Cleito coil you start vaping below the coil's minimum voltage requirement, thus the vape quality would be poor."
I still think that it is a good purchase, despite the inability to adjust the wattage/voltage of the battery, but I think it's important to know that you'll need 0.27 ohm coils for the k4. Vape Shop does not currently carry this newer coil yet, so just something to consider.
I hope this is helpful.
2/12/2017 9:12 PM
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