Two batteries were not enough, I was going through these batteries too quickly when using my Rival MT10. So I picked up two pack of Hoovo 6500mah 120c 3S batteries. Only have a few runs on them but so far they are working great. Im sure the stats on them are over inflated but they seem to be comparable to the Lectron Pro 5200 50c 3S battery I got from my local hobby shop.
I purchased a new battery charger. I wanted something that could charge two batteries as well as had the ability to charge for storage and discharge my batteries. Most of the chargers with these features are pretty expensive but found that my local hobby shop had a great price on the Gens Ace IMars Dual Port charger. This was recommended to me on an RC discord channel I joined and was within the price range I wanted. It has XT60 on the charge and adapter cables for Deans, EC3 and EC5. It supports 1S to 6S Lipo batteries as well as a few other common battery types. Only have used it a few time but think its exactly what I wanted.