COACH BATTERIES

[hippieforever3]

> OK, I read it. I only see confirmation that 100% discharge is a bad
thing. What are you thinking it says?
>

I admitted I was unclear. 100% discharge is unhealthy but some deep
cycle batteries are designed for up to 80% discharge. As a general
rule, batteries will last the longest and provide the best service if
they are used close to the limits of their design.

It's a little like atheletes, If they never strain a little they get
weaker. If you over stress them they get damaged.

> True, but that's equating "useful" with cranking, when our most-
common concern is total capacity, for house use. You used AH in your
55/100 example, and that is not cranking capacity. You will not be
able to design 100AH in the same amount of space that you would use
for 55AH, no matter how good the design.
>

That would be true if batteries weren't made in standard sizes.
However to offer choices to the marketplace, manufacturers will stuff
the guts of a 100ah battery into EXACTLY the same case as a 55ah
battery.

The reason that the 55ah batteries exist at all is that when you buy
a new car it comes with a battery and most car manufacturers will do
almost anything to save as little as $0.50 in their costs. They
aren't equipping your new car with one ounce more lead than they have
to.

Regards,
GPSGary