Darth / Terminator 18650 battery recommendation?

I picked up a black shadow Darth of EBay, thinking of pulling the trigger on the Terminator as well.

They’re both multicell lights, but paralleled.

Is a Protected cell necessary? I was looking at AW IMR at lighhound for 11.50 ea.
Saw a link to protected Sanyos at fastech that look decent too.
Any other recommendations for a 18650 cell?

Also debating between the Intellicharge i4 or an accucell 6 charger.

Thanks!