I'm getting the same thing, sort of.
When I start charging, it goes up to 50% pretty quickly and then takes a long time to go up to 100%.
When I take it off the charger and start using it, it goes to 80% very quickly, then down to 50% somewhat fast, and by about 8 hours into the day, down to 30%. But the lower the battery goes, the slower it seems to drain. I think it's something with the indicator rather than with the battery. I can spend all evening between 15% and 30%, it seems.
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