Very difficult to diagnose this without actually being there!
My first test would be to see whether the battery is in fact being charged properly by the alternator. It should float at about 14.4V when on charge. An ammeter in series will show the charge rate. With everything switched on (lights, heaters etc) the voltage should hold up while the engine's running at sensible revs. The voltage should never rise above about 15V under normal conditions and never fall below 10V except when cranking. Outside these limits, the battery can be damaged.
Assuming it's getting charged, the next question is whether it's getting discharged by something. Modern vehicles draw a lot of current even sitting in the garage doing nothing. If for some reason I don't drive my Discovery 4x4 for two weeks, the battery goes flat because of the standby current drawn by the various electronic gizmos, and the battery's own self-discharge (modern batteries being worse in this respect). In winter it's even worse, as the battery may not get a decent charge on short runs due to lights and heaters taking most of the alternator's output. Also the starter draws more in cold conditions. My feeling is that batteries and alternators are often a bit undersized these days, probably to save money. On normal discharge the voltage should be around 12V, depending on the state of charge.
You should also consider the possibility of intermittent connections somewhere in the charging system. In particular check the battery connections and ground wire.
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