I see the 30 amp 18650 is the biggest for the nemesis clone. Is there a difference in battery output for each size battery? Also, what is the best charger for these batteries?
Links to websites of where to buy these would be a +
Before buying anything you should do some research into learning about batteries first. Instead of asking for other's opinions and them telling you what THEY think is best, do the research so that you can make an informed decision & choose the best batteries and charger for YOUR applications.
You've given no information about what your applications for the batteries in the nemesis clone are planned. Are you going to use coils above 1.0 ohm, or sub-ohm coils? Your answer determines which battery to use. You won't need a 30 amp battery if you are using 1.0 ohm coils or higher, but if you are using sub-ohm, you need a 30 amp battery.
All lithium ion batteries have an output of 4.2 volts fresh off the charger regardless of battery size. The mean voltage is considered to be 3.7 volts.
A very important battery specification is the
amps in continuous discharge rate. This can vary by size of the battery (18350, 18490, 18650), and by the chemistry of the battery (ICR, IMR, hybrid).
Battery Basics for Mods: IMR or Protected ICR?
Deeper Understanding of Mod Batteries
The Pila, XTar, and Nitecore Intellicharger are all excellent chargers for mod batteries.
RTD Vapor is an excellent online vendor for quality batteries and chargers.
Authentic AW Batteries at RTD Vapor