leebases advice was the rule when batteries were NiCd. They were notorious for being LAZY (capacity wise) if you did not do full swing usage.
I have never had modern NiMh (common in phones and readers) exhibit that, even when kept 'topped off'
Your charger needs to handle the added load of work and charging.
Using the USB port on a computer is severely power limited and not suitable for this type of usage.
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