How about a PCC? I've gotten so used to swapping out the batteries frequently but the PCC has been great addition for me. The charge on it has lasted for 2 days. I can take it anywhere and always have a freshly charged battery. It carries 2 carts and a spare atty. I can toss it in my purse, stick it in my pocket and keep it accessible while I charge it in my car.
I've accumulated six batteries - I started collecting by ordering more "kits" when my first atties started going wonky on me. When I'm home or working at my computer, I keep 2 in the chargers, 1 in the PCC and vape on one. I have 2 in my vape-box on reserve.
I haven't tried a PT yet, but from everything I read it seems so logical. I do spend a considerable amount of time on my laptop. Not having to worry about decreasing performance and swapping out batteries would be really nice.
Spare atties - *nod* - I placed an order for 4 more today after I experienced my first atty-death (may it rest in pieces

a few have been on their last legs).
If I had to choose, I'd build my atty reserve before collecting batteries. More than two makes me feel secure though.
I also found a really good carrying case at the dollar store. It's a metal case with reading glasses inside of it, comes in several different colors and holds an assembled 510, a spare cartridge and a 3ml bottle of smoke-juice. It's sleek, looks nice, and for a buck? I hope they have more of them when I go back there!