Hi Brian, 
I've had my Joker for a few days now ( Yes Sarge a purple one  ) and I'm loving it also. The light on the battery charger will turn green when they are fully charged. I'm not sure how long it takes to charge them, I haven't been watching.  Right now I'm getting 7-8 hours from my batts, but I'm vaping like a madman right now.  
I put on a 510-801 adapter and I'm loving the 801 at this voltage. Much like I do on my PT. The cartos are working great also.