From what I understand about Li-ion batteries frequent charging of the battery is not a problem and doesn't result in a memory issue within the battery. Occasionally they should be drained to almost empty but it is not necessary to cycle them from full to empty. They tend to be rated with how many full charges they will take before they start to loose their effeciency. Two 50% charges have the same effect on the battery as one 100% charge as far as the life of the battery is concerned. With these devices I don't think there should be an issue with running them during the day and topping it off once or twice with an additional charge to ensure they last through the evening.
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