These will be my 1st APV's that didn't come with batteries internally so I've gotten myself a Nite core i4 charger but am still unsure of all the battery basics. I've heard so many conflicting things. I would like to try both 18650's and 18350's so I'm able to use the telescoping on Zmax and both short and long attachments on SVD. If anyone has any personal experience with these APV'S and can tell me which brand & model # are the best and will last me between 8-12 hours per charge, I'd sure be grateful 
