Let's say I have a 10 AH rated gel cell VRLA battery. If I consistently use=
 this hypothetical battery to a 50% depth of discharge and get 850 cycles o=
ut of it, I've gotten 4250 AH of use from it. If I have another identical b=
attery that I get only 500 cycles, but at a depth of discharge of 85%, I've=
 still gotten 4250 AH of use. These are fake numbers, of course.

It is "common knowledge" that anything more than 20% DOD shortens the life =
of lead-acid batteries, but where's the point that it starts or stops makin=
g economic sense, especially when it comes to batteries that are in cyclic =
use? Does anyone know of any somewhat trustable numbers regarding depth of =
discharge and cycle life of VRLA batteries(gel cell or any other type)? I'd=
 love to see data on that.

Thanks!

Bob
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