Honestly, forget about it. The only real way to extend how long a Li-Ion battery lasts is not to use it. Charge it to about 40% and store in a cool dry place.
All except one of those are common suggestions. The one that is not is
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Best to recharge when the device gets down to 70-80% full
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That isn't normal and I didn't see it on the page linked. In fat the recommendation is usually not to charge above about 80%. The recommendation is to keep the charge level close to the middle. So, between about 30% an 70%. Or 20% and 80% depending on who is talking. This is so common, that there are laptops that have an option to stop charging when they get to 80%.
My opinion after using a lot of different Li-Ion battery powered devices, and a lot of research is that it just isn't worth it. Anything you do means a lot of work, basically means you don't use the battery and doesn't have a big enough effect to make it worth it. Just use the device. Charge it when you can. Run the battery down if you can't charge it and want to read.