That's cool how you inverted the sleeve to view the screen and use the buttons but I suggest buying a external battery charger to always have a battery ready.
Using capsules should have no affect on battery life, only one needs to be a little more patient while the flowers heat up, I've used them with the Flowermate V5.0s and they worked great, no mess no fuss.
You're lowered the cost of shipping but raised the spacers $1.00
It's best to buy a Nitecore D2 battery charger and not charge the battery in the unit.