I can absolutely 100% guarantee you that you're wrong. In fact it would be IMPOSSIBLE for them not to be draining the
batteries unless your mods have toggle switches like a light switch wired between the battery and the chip that break the circuit entirely, but then you would need to flip the toggle switch for the fire button to work.
Any
mod that turns on with the fire button is ALWAYS on, and ALWAYS drains the battery to some extent. It's absolutely impossible for them not to. The battery carriage is wired to the chip and the fire button is wired to the chip and the only way the chip knows the fire button is pressed is by monitoring the voltage change when you press the button. The
mod is never OFF, it's only in a locked sleep mode. The ONLY difference between the SnowWolf and any other mod in this regard is that the SnowWolf wakes up from a single press and then you unlock it, rather than waking it up and unlocking it at the same time.
Look at the wiring schematics of any chip out there. The batteries are wired directly to the chip, the fire button is wired directly to the chip, the only way the fire button can receive power is if the chip is being powered. If the chip wasn't powered the buttons would be on a dead circuit and wouldn't work.