This NP / NPH / NPX series Yuasa battery has an FR suffix at the end of the part number. What does it mean?
An application manual was found on the supplier website at the following link.
This screen grab from that manual shows what part numbers are available and contains a note that indicates the meaning of the FR suffix.
NOTE:
There are two versions of this. You will have to find your part number above and figure out if it is rated for UL94 or UL94-V2
∗ FR: Containers and covers made from Flame Retardant materials
(UL1778 and UL94/L.O.I.28%).∗∗ FR: Containers and covers made from Flame Retardant materials
UL1778 and UL94-V2, L.O.I.28%).