Oh boy. This is a "can of worms" we've discussed before.
My personal paraphrase of the topic is that dual batteries are not worth it.
If you typically maintain your batteries, you'll be gaining very little.
If you typically skimp on your battery maintenance, you'll be gaining very
little.
Plus, how will you install the redundant battery? Disagreements exist here
as well. If you add extra components, you add points of failure. Often these
points will be "mission critical" and your added redundancy will STILL be
adding single points where a failure will equal loss of the plane. So what
will you have gained?
In light of the above, I suggest: Use a new battery and new wires and
connectors. Test your battery regularly. REPLACE your battery regularly,
approximately once every two years. If it's a VERY expensive plane or if
you're a "worrier" do it every year.
Bill Swingle
Janesville, CA
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