bestconverter's blurb says:
"Output voltage can be FACTORY ADJUSTED to meet OEM requirements for various lithium ion battery chemistries and Voltages. Standard āLā Series voltages are set for 14.6- Volts to meet requirements for lithium iron phosphate batteries. Other chemistries may require different voltages"
So if your Li doesn't like 14.6v, I suppose you have to special order your 9100L.
I have not checked to see if there is a place on the usual on-line ordering "carts" where you fill in what voltage you want yours to be.