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The real problem is that proper operation of the cells has to be supervised by a human, in real time. You have to notice (humanly) that it's at 40% (time to recharge) and get there before it crests 80% (risk of overcharge) -- except for a (say) bi-monthly calibration cycle (see earlier in this thread).
The manufacturers are making it difficult to do what is known to be best for the batteries, from an operational standpoint.
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