I have all my mods set up exactly the same - same juice, same atty, same build. I used to just grab one, vape it, later grab another, vape it, repeat. Over the course of the day I prolly vaped all 4.
This led to frequent battery changes - most prolly premature (cause I would never leave the house without a fresh battery in the mod even if I changed it only an hour prior) frequent juice refills. They always had batteries in different states of drain in them.
So I devised me a system:
I use a mod for the day. I put in a fresh battery in the morning and one right before I pick up my kids.
Later that night that battery goes on the charger.
The mod gets placed on the desk with the door off so I can see that it's not ready (either needs a battery and / or refill). Ever left the house with a mod and no battery in it? That's why I leave the door off
The next day I repeat with a different mod, and so on until their all ready for a refill.
Now I clean atty and tips and refill all four of them all at once.

This led to frequent battery changes - most prolly premature (cause I would never leave the house without a fresh battery in the mod even if I changed it only an hour prior) frequent juice refills. They always had batteries in different states of drain in them.
So I devised me a system:
I use a mod for the day. I put in a fresh battery in the morning and one right before I pick up my kids.
Later that night that battery goes on the charger.
The mod gets placed on the desk with the door off so I can see that it's not ready (either needs a battery and / or refill). Ever left the house with a mod and no battery in it? That's why I leave the door off
The next day I repeat with a different mod, and so on until their all ready for a refill.
Now I clean atty and tips and refill all four of them all at once.