To summarize the information (in more accurate terms), charge your device whenever possible, and try to avoid having it drain to very low energy levels.
1 cycle = 1 full discharge and 1 full charge, this means that if you discharge it to 1/2 and then charge it, that counts as 1/2 a cycle. Usually modern Li-ion batteries last anywhere from 500 to a few thousand charge cycles, but this just means that it'll drop to 50% capacity after that many cycles. Your device will function just as well as it would, it would just hold half the full charge (it won't be dead).
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