I would not go on any kind of trip with just 2 batteries and a PCC. PCCs are not foolproof.
If you want to be extra sure and just in case you screw up charging with the PCC - for $29 buy a Riva Lite Bundle at Liberty-Flights.com (first click the 20% off in the upper left corner of the front page and that will lower the prices shown). Then look at the Riva 510 section. The Riva 510 Lite Bundle should be under $30. And if you care about having a decorative cone piece that will fit over a carto, then also buy a single Riva 901 cone (it's a shorter cone with a slightly wider hole). You can also buy an Ego button protector clip in the Ego batteries section
If you buy that Riva 510 you would get a pair of 510-compatible 750mah batteries. Its charger cable and attys (LR attys) are only to be used on fat battery models, not the slim 510. I labeled the charging cable to make sure I didn't stick a slim battery in it.
So if I was you, what would bring is
Your 510 stuff, PCC, 2 510 charging cables, 1 PCC charging cable, cartos, juices
One Riva battery, its charging cable
A lipstick case to carry the Riva battery in (I will explain below)
A Rosewill 4-port 2amp USB to AC adapter (to charge 2 510 batts, 1 Riva batt and PCC overnight)
Newegg.com - Rosewill 2 Amp 4 Port USB International Traveling Wall Charger RUC-6181 for iPhone/iPod/iPad/MP3
Re the lipstick case - the Riva button presses in easily and I have trouble getting the Ego button clip to work right for me. So I wrap a bit of foam or folded paper towel around the middle of the Riva battery to make sure the button won't touch any side, and I put it in the lipstick case. Search Ebay for lipstick case, then select the Buy it Now tab, then order by lowest price. Scroll down just a bit to see the cheap cloth-covered lipstick cases.
So if you have a charged up Riva battery with you, then even if you mess up charging a 510 battery or if the PCC runs out of charge, you will have the Riva and if you think it looks funny, you could vape it in a bathroom stall.
If you don't like that idea, then instead just buy one 510 mega xl manual battery as well as the Rosewill 4-port and enough 510 charging cables for all of your batteries, and use the 510 mega xl as the emergency spare you could carry with you.
