So? Obviously the PW5 has better battery life. If that is what you care about the most, why torture yourself with those experiments? Just sell your Libra and buy a new PW.
Personally I don't care. The Libra has good enough battery life for me. My Sage is a lot worse and I somehow still manage to read happily on it almost every day. But then battery life has never been a priority for me. As long as the battery lasts for a couple of days, I'm content.
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