The ego PT
batteries will only charge to 3.4-3.5V, whereas my 18650 batteries are reading 4.1V. Your are going to loose a little as far a vapor production, flavor and warmth of the vapor. I used a PT for a while but didn't like the feeling of being chained to my computer. Charging the batteries every 2 days isn't a big enough hassle to make me want to go back to that.
What would be nice though is if the Reo Grand 2.0 came with it's own charging base, similar to a cordless phone.