Robust battery [RE-wrenches]

[Bruce Geddes]

Just a few thoughts....

As discussed before there is no one perfect battery for every application.

A poorly maintained flooded battery will not last as long a sealed, but a
well maintained flooded will outlast sealed.  Flooded batteries smell, leak,
corrode etc.  Correct installation and maintenance will overcome all of
those.

There is probably more variation between types of flooded and sealed battery
than there is between the two technologies.  Not all flooded batteries are
created equal, ditto sealed.

Flooded batteries are better able to dissipate heat than sealed due to a
large contact area between electrolyte and the case, but a large block of
cells means the middle ones will run warmer.

In a situation where the battery is going to be pushed (large peak charge /
discharge currents, deep cycle depth) I would opt for flooded traction
cells.  In a situation where the customer wants a maintainence free system,
AGM's.

There is no best battery - you need to size up your customer and the
application.  There are many brands of good battery out there of both types
and there are even more brands of less than great battery!  Rough rule of
thumb  weight = lead = performance and life.  Weight also = $.  Investigate
each option.

If you are in a warm climate, perhaps NiCd or NiFe could be an option to get
better current dleivery and life but at the sacrifice of efficiency.

Bruce Geddes
PowerOn

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