X-Mozilla-Keys:                                                                                 
Keith Moore wrote:

This is an interesting subject.

The issue is battery  capacity, which is defined as a function of age. 
As lead acid batteries get older, they have less capacity (or energy),
even though the voltage and cranking power may be sufficient to start
the engine.   When really needed as an electrical emergency source,  an
old battery (12 months or so) quickly fails.

One of the better summaries I've seen on Aircraft Electrical Systems;
reliability, batteries, redundant circuits, etc., was in Tracy's Crooks
Newsletter a few months ago.

Regards,

Keith "Blackhat" Moore

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