Agree...it is very unlikely you can charge parallel batteries of different ages and manufacturers to full capacity -- nor will they provide a good discharge performance.
Further, the float charge voltage of your batteries should be at least 13.8 to 14 volts, and an equalizing charge should be provided periodically.
Chuck
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2007 Tour Master T40C
Acura MDX toad
"It takes a great deal of time to recover from any improvement..."
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