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You should upgrade or use an alternative browser. I get 3 hours of battery life from M1 iPad Air. It is terrible and the ONLY thing I use it for is reading a newspaper online for about 45 minutes to an hour. After 3 days I need to recharge as I am below 10%. This thing has a lousy battery life.
How does the M2 Air do? Maybe upgrade to M3 down the road any suggestions?