Theres a
thread on model type specific kr808d-1. There you should find answers to allmost all you can think of.
But can tell you here, that there are several different types like kr808d-1p and 808d-2 and others.
Stick with the d-1, would be my advice. Thats the one most vendors sell, and have heard from several that tried both, that they like the d-1 better..
So go with d-1 or you'll make things a lot more difficult for yourself.
If your gonne go the kr808 way, go tjeck out Bloog's new maxxfusion. Thats the newest updated d-1 with higher mAh in same size batts. Thats the one I'm getting next. They claim to have ironed out the most irritating flaws( witch every PV has) Like cartos that burn and selfactivating autos and so on.. They cost a little more though. I use adapters for my ego, to have a big batt option as backup, but when it dies I'll deffo just get the pigcig..
You can use the chargers you've got, if you get adapters. I started with 510 so instead of getting new chargers, I got those. Adapters are annoing if you use them for diff batt types on diff cartos and such, but with chargers, I just leave them in all the time, so its no hassle. Just like having kr8 chargers..