http://www.raritaneng.com/pdf_files/chargers/L46v1295%20B%20Series%20Manual.pdf

It shows a finishing voltage that looks "suspect" for gel cells and no adjustment.

On further (intense momentary research ;^))) )

http://www.raritaneng.com/information/faq_topics/faq_converters.html

ANSWER: Your assumption that because the Raritan unit and the gell cells are "there", and they must be okay, is misplaced trust.

http://www.raritaneng.com/information/faq_topics/faq_converters.html

A2: May Raritan converters be used to charge "gel" cell batteries?

Raritan "F" series converters are designed for conventional lead/acid batteries only.
Attempting to use the "F" series converter to maintain "gel" cell
and the newer "AGM" batteries will give unsatisfactory results.

Raritan "B" series converters will satisfactorily maintain "gel" cell
and "AGM" batteries but require an internal adjustment,
contact Raritan Technical Support for details.