I was under the impression that modern devices should have a couple of drain/charge cycles to calibrate the battery and software and then it was better for battery life to keep them 'topped off' with shorter more regular charges than significant drain/charge cycles.
Only to re-calibrate should they be drained again very low if battery life seems poor.
Of course, this can all depend on the setup and battery type used, but it seems what most devices recommned these days.
Still, I guess Apple should know and if they say drain once a month....
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