I had a nearly new battery "lose" a cell this year and got a new replacement under warranty. While I was figuring out the problem, I took readings on the battery. Maybe they will be of use to anyone trying to diagnose their starting issues.
[FONT=verdana,sans-serif]With the good replacement battery, idling @ 2,100+, voltage across the battery terminals was 14.70.
[/FONT][FONT=verdana,sans-serif]The bad battery, read a voltage of just under 14. But immediately after, 12.6.
An hour later, 11.7, and the next morning, after sitting all night it read 10.71.
Over the next couple of days it declined only slightly further to 10.53. Having reached that mark, it was able to hold that reading.
What could the battery do at 10.53? SBA - made the dash lights go on but the starter didn't even make a noise, never mind turn over. The replacement battery, read 12.7 the next day and cranked the engine like nothing. [/FONT]