I did a short test with my Vapcell S4 Plus V3.0 in the power-bank mode, with 4 brand new Molicel P28B 18650 batteries (only one storage charge at 50% - 3.7V since i got them) !
So i decided to check them out how they are after a few months in storage !
When i put them in the charger they were pretty good ( some of them was at 47% and some others all most 50%) after the “charger reading” in a few minutes the charger started beeping that i had completed battery at 50%, so im good so far… !
Then i plug them on the phone when it was 30%, and after the short test (almost 1 hour) the batteries are down to 30% and the phone up to 70%, so i stop it because i didn’t want to “force” the batteries below then that !
So im pretty good with that, no problem, no smell, no heat, no nothing, everything is working perfectly ! Im pretty pleased with it !