If your 9145 has the optional charge wizard like my 9180 Replace with same model as there is none better than a PD-wizard controlled converter for standard batteries.
If it does not then the 9200 series is the same unit WITH the Wizard built in.
If you call Progressive Dynamics you may snag a Factory Rebuilt . bit cheaper and if your unit is less than 10 years old they may have an even better deal.
or if you are Near Marshall Michigan (dead center about 35 miles north of Indiana) Do Drop In the factory.. I did.