I have a few different parts from a lot of places and they are all compatible -except one**PCC I haven't tested anything but just by use, I tend to think the Janty
batteries keep a charge longer. I don't know if it's the fact that they have no LED or if it's something else or if it's just my whacked perception

I haven't had any attys fail but I do regular maintenance....
The PCC I got from Janty** - first 510 didn't have the slot for the manual, so make sure it's 'manual compatible'. I tend to think they all might be now but check. And frankly, if you're going to get one and also want some back up parts - a few of innovapor's kits - one with one ecig and another with 2, include either a PCC or pelican case in the package which you designate on checkout. Also grab the coupon codes in the 'suppliers' forum here.