I'm fairly certain I've seen posts on here with many of you guys using REOS. I feel like to get the most out of my NT juices, this is the route I'm headed! I do have a couple questions if you don't mind. I ordered the Reo Grand. I need to order batteries, charger...ect. My questions are: how many 18650 batteries do I need? What type of charger is the best? Do I need a multi meter? Best place to get these?