no 400mah is the smallest they will go
I was just chatting with zippersnapper about this issue ( size ) earlier... If you don't like the technical aspects, you may want to skip the rest of this post... lol
Variable voltage/wattage devices require a lot of amperage output in order to work. This is why they use the high drain LiMn
batteries instead of just the ordinary Li-on.
A high drain LiMn like we are using here are capable of providing up to 10 times their rated MAH rating... normally this is refered to as it's "C" rating.... in this case/example a LiMn provides 10c of current. Examples would be a 300mah battery can provide up to 3 amps, a 400mah can provide up to 4a etc.... While these batteries are well capable of providing current up to their rating, constantly pulling that amount of current can shorten their lifespan. To help avoiding a shortened lifespan on your bats... you try to use one that can provide more current than you may end up using so you are not working the battery too hard.
Now you should know what the maximum could load that COULD be used ( not that they will ). These provide up to 4.8v and commonly go down to 1.5 ohm ( lower is available but not as common ). The load that running a 1.5 ohm carto/atty at 4.8v is 3.2 amps ( and over 15 watts which is very hot btw ) ... This amount of load would be more than just a 300mah 10C battery can provide and a 350mah battery wouldn't have much more "overhead"... So that is part of why a 400mah battery is around the smallest you want for VV use.
While the 400 mah version isn't going to be an all day PV.... it should be perfect for those short trips out providing a few hours of
vaping give or take depending on use.