co2 oil

I am trying to make some canna caps with my CO2 oil and I seem to be hung up on the math. I was hoping someone with better math skills may be willing to help. Here's my list I'm working with: 1 gram activated CO2 oil - 69% THC so I believe roughly 690mg Size "00" gelatin...

New to the FC...I recently got some 500mg co2 oil cartridges, what is the Best battery for them? I've heard they need low voltage to avoid damaging them.