Yeah, Ego-class chargers and LR cartomizers and and LR atomizers are not for slim 510 batteries - they are only for the fatter 510 batteries like Ego and Riva 510 which also have beefed up electronics inside. Any of those things may damage or kill slim 510 batteries
Mega carts are only for Mega atty - the carts are longer and fit in the longer tube of the Mega atty. A standard resistance Mega atty should fit any 510
510 mega batteries fit in mega 510 PCC, standard 510 batteries fit in normal 510 PCC (Note - VaporKings.com sells a mega PCC with an adapter for charging a normal short 510 battery). The roomier plastic PCCs I have seen around for 510 are only for the standard 510 batteries (like the Vapormaxx PCC at NoSmokeVA)
I don't what the power needs are of the 510 PT with the inline battery. Most battery charger AC to USB adapters (and computer USB) are not sufficient power for most PTs, I think including the 510/Ego PTs with no inline battery.