In all fairness @Silver you really only need max 40w on a single coil build.
Even the fancy builds!
The 60w board is more efficient and thus has better battery life than the 40.
As for battery efficiency I have a different scale that works for me. I gauge ml per battery on similar ohm builds.
I could only get max 6ml out of a reo with 1 battery and I can get 12 to 15ml out of 1 battery on a BB.
Obviously there are other factors but that it how it works for me.
Even the fancy builds!
The 60w board is more efficient and thus has better battery life than the 40.
As for battery efficiency I have a different scale that works for me. I gauge ml per battery on similar ohm builds.
I could only get max 6ml out of a reo with 1 battery and I can get 12 to 15ml out of 1 battery on a BB.
Obviously there are other factors but that it how it works for me.