I can find all kinds of specifications for the Lithium-Ion NP-1 battery; however, I can't find out when you should charge the battery. I know the battery should be removed from the "Cradle" when the light goes out; but, when should I start charging the battery. 1. After each use? 2. Before each use? 3. Does it matter how many times I charge the battery? 4. Does it matter if the battery is slightly discharged, and I decide to bring it up to a full charge before each use?