The problem with protected batts is that they are mostly not made to handle the draw of the typical atomizer. Granted your vamo and most Regulated mods have internal protection circuts, BUT the protection circuit of the battery can interfer with that. KILLING both systems. This is why it is recommended to use a battery rated higher than the power expected to be applied to the atomizer even with a regulated mod with protective circuits. Circuit that make it possible if un-advised to use lower than optimally rated batteries, in regulated mods.