[sandreas]

It's probably not a flaky USB cable. Androids charging limit of 80% includes a policy to charge 100% every 14 days to recalibrate the battery controller.

A possibility to limit charging to ~65% does not exist per se but you can measure the time it takes to charge from 25% to 65% and use a power timer to shut down charging after that period of time. It's not accurate but easy to implement.

Another factor is fast charging... The battery loses capscity significantly faster if you fast charge often...

I personally only use the 80% limitation...

[avidiax]

Maybe I just expect too much battery life, but I find that I get quite low or even run out when I limit charging to 80%.

My feeling is that the coulomb counting on the Pixel 8 Pro is just not very accurate, so the phone thinks it's at 80%, but is really at 60% or 40%.

I still use the feature, but now I have to top up during the day every so often. I suppose rationally I should just charge to 100% rather than take a medicine that causes the same side effect as the disease its meant to treat, but I'm not that rational.

[sandreas]

Absolutely. I find it strange that Google decides to provide a fixed value of 80%. A slider from 65% to 95% would be more sufficient...

95% would probably work out for you and still decrease battery wearout...