The Model ProSport6 says;
Bank Config. Single
Total Amps Distributed 6 Amps
Use with # of Batteries 1
Battery System 12 VDC
The ProSport8, 12, 20 and 20 Plus have Dual and Triple config 2-3 battries 12/24/36 VDC depending on model.
I just assume since the ProSport6 say only 1 battery then the triclke 1.5 amp be the same. But, maybe those more knowlegdeable can make it work with one bank of 2 or more batteries. Myself, I would just try one with a simple trickle, I assume it not regulated.
I not know how to get a link. I typed;
Promariner 1.5 maintenance charger
into a Yahoo search and seen;
[PDF] PROMARINER PROSPORT MANUAL 1030
I clicked and learned, then try to share what the manual say. True, it not mention the 1.5 amp.
This link here;
PROMARINER PROSPORT 1.5 AMP PORTABLE MAINTAINER 10115
Does say Fully Automatic and it use batteries *Plural*