it's weird as my understanding is the procells are just the industrial variants (read sold in boxed quantities) of the standard duracell. I know duracell have a few high power variants which are not equivalentI'm currently using a standard (gold & black) Duracell battery in mine now and all seems fine so far.
So general opinion looks like Procells are no use in an Lv1 then .
I use the Energy batteries in my Clone GTi and it has a decent lifespan... and using them on the LV1 sees similar performanceI cant knock the energy batteries like, the first one lasted about 6month, playing at least once a month going through 4k paintballs, and since i got it back from planet with a fresh energy battery its still showing as full, and that was 3? month back.