The battery compartment is a security measure which regulates the voltage.
For BATCH 1 we had a USB cable with a on/off switch, but this didn't make too much sense to me. It will only charge the battery when it is in the ON position.
So I told my engineers to get rid of that switch for the next batch. BATCH 2 has no switch on the USB cable, the battery charges automatically when you connect it to the USB (these little batteries are pre-charged already for about 60%) with no need for a ON/OFF switch.
For as long as this battery is charged, you can smoke. When you puff, it draws energy out of the battery and in between puffs it will charge from the USB port. So you should always have enough power (charging time from a usb port output is very fast!).
Now BATCH 3 is underway to The Netherlands. This new batch consists of new switches, new usb cables with a higher resistance than batch 1 or batch 2. So anyone who should encounter a problem with any of the parts of the KISSBOX Classic, will receive a full replacement (new switch + new USB cable).
Note that since we're talking about charging and electricity, the KISS usb cable is not an ordinary usb cable and you should take care not to leave it unattended while it is still connected to the USB port or any other USB power connection.