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That's a hold over from days gone by. Batteries nowadays are Lithium-Ion (or more rarely Nickel–Metal Hydride) not Nickel-Cadmium which had the memory effect issue. It doesn't matter any more. Charge and use as you see fit.
What is still true is that no matter the tech a battery will lose capacity over time but there's little you can do about it unless you want to put it in a freezer (half charged). Just forget about it and charge when you have the opportunity.
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