Only one...definitely: The VTC5A.
Nope...that is shillbut...nonsense.
You can use other batteries...as well. Depends on what your opinions related to the watts are. HG2 wil work fine also...or 30Q...or...never NCR18650B!
Best choice is still the VTC5A. But...I choosed 2 sets of HG2 for my now one year old RX200...all one year old now!
It is fine! I did not matter about the continous discharge rating...but do not want to discuss with ***s like K**D or that Canadian...they act like missionars!
Think about that: You have a mod...that works with 2 or 3 batteries...
You need at least one pair...for 2-batteries-mode...and 3 marriaged (or somewhat).
NEVER MIX IT UP!
One VTC5A is ok for 100 watts...no matter what the missionars say. 3 are good for more than the 250...
Never need that? Hold on...