T&T: Batteries

[Robin Brueckner]

Greast post by Bob Austin..Thanks for the effort!
Last time I searched I could not find so much data.

The only point I'd add that is plate thickness is intentionally different for
start versus deep cycle batteries. The logic is that for slow (low current)
discharge deep cycle applications  ion migration can replenish the chemical
reactions deep inside thick plates; for high discharge (big currents, like
starting) thin plates are preferred to power repeated starting attempts...

The few brands of deep cycle I've used (pair of 8D's in parallel) start my
8V71TI's just fine...Powermaster, Interstate, Exide...but they all last only
about five years. VERY disappointing because I do NOT abuse them. And Of
course I have no idea if they are REALLY deep cycle designs. But I use mine
steadily six months full time annually.

I also have read that some manufacturers use different mixes of acids and acid
concentrations so specific gravity can vary among brands....
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