How will I recognize failing battery?

Is there a common set of symptoms or figures that will alert me to immient battery failure on my mid-2009 MacBook Pro?  My concern is not current performance, but a fear that it may slide quickly from acceptable to unacceptable performance.
The machine is shared by the three of us in the household, so I can't fully control how it is (ab)used.  When new, it sat for hours on charge until I learned the error of that way.  Machine still routinely sits for long hours in sleep mode.  Occaisionally the battery is exhausted and must be plugged in to boot.  This, from what I've read here, may at least be accomplishing a recalibration (?)  Cycle count is currently 393 and "battery health" by my calculation is 97%.
Battery performance seems, somewhat degraded, but after 2.5 years of the use described above this seems understandable.  Again, my concern is not current performance, but knowing how to recognize that replacement time has arrived.  I don't want to leave home only to find that its suddenly in death throes.  I'm 100 miles from the nearest Apple Store.
Thanks.

Then you will need to estimate via Z1 LED indicator.
Red = your battery percentage is below 15%
Yellow = battery is 15% above until 89%
Green = battery is 90% above
I'll give you some tips on how to maintain li-ion batteries.
* Charging li-ion batteries to max level (100%) will prolong battery capacity but shorten battery lifespan
* Frequent charging of li-ion batteries (not fully charge or random charging) will increase battery lifespan but shorten battery capacity
* High battery temperature is bad for li-ion
* Full discharging also shorten battery lifespan, but corrects battery stability and performance

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