You're not losing any power in the electronics than on an apv like the svd; the loss would be like maybe 10 or 20%.
On the mech, you also use less power per vape and the battery deteriorates, while on the apv svd the regulation keeps drawing the same power per vape so you'll end up with less vapes before the battery runs down.
this was meant to be a smart comment in regards to the battery comment that i quoted with it...
but thanks for that...