I can barely get by with three batteries in a day.
These atomizers turn on and off a lot, they draw power from a very tiny battery. The battery has enough power when charged but degrades because its lithium battery. On and Off / recharging will damage it over time.
You must replace them.
To get max power you need a usb passthrough, plug this into a usb slot. You can plug it into a computer to power it OR a different, better battery pack. You carry the e-pen, yeah it has a wire going to pocket with usb passthrough and battery pack (pretty dang small) in your pocket.
Who cares its the only way to get around weak batteries. Batteries that fit on small objects like these cigs and pens that are lithium based CANT power our e-cigs well. Get a battery pack + passthrough that is usb and for portable devices, make sure it will power everything enough buy asking someone and research on forums.