> Below 10.6V they're considered flat
> 
> That's no-load voltage. Under heavy load, like starter, voltage can
> be much lower. When load is removed, voltage slowly rises back

Yes, I did mean the unloaded terminal voltage, eg a battery that's
being sitting for a while, or even a very cold one. A good battery
of appropriate capacity would be able to supply the crank current
without the voltage dipping significantly


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