I too am examining the Powersafe SBS J-16 battery to replace an aged Concorde RG-35AXC in my 64' M20C . At this point the consideration is mostly due diligence. On paper the weight savings & cost of the SBS are appealing.
Bttry wt (lbs) $ CCA Ah
SBS 15 169 220 16
AXC 32 335 440 33
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Rich,
It isn't Mooney specific, but I found a thread at http://www.shortwingpipers.org/forum/archive/index.php/t-4378.html that discusses 337 approval of the SBS J-16 battery in certified PA-22. Might that be helpful ?
Gee