Morph-

That voltage, 13.56, should be enough. Higher would be beter,like 14.5.

Couple thingss to do:

Check the voltage at the alternator with engine idling, see if it is higher - might indicate a small drain between there and the battery.

Disconnect a battery cable if the car is to sit a day or two. Either cable, I usually pull off the one easiest to do - the one farthest from the fender.

If the car fires right up when reconnected, there is likely a current drain somewhere (suspect the central locking system relay). If the battery won't fire the engine, suspect that the battery is failing.

Good Luck,

Bob

:>)