When to charge is up to you. Storing the player in a fully charged state for a long period of time will accelerate permanent deterioration of the battery. This effect is especially significant in hot temperatures, while in low temperatures it is much less of a factor. I wouldn’t worry about this too much unless you are in a very hot climate without air conditioning, and use your player infrequently. At 140 degrees F, the battery might lose 40% of its power holding capacity if left fully charged for just 3 months. This is also a reminder for people not to leave a player in a car during the summer months.
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