I’ve been astonished at how bad the battery is in my base iPad I bought last year. Granted I’m switching to it from an iPhone 17 pro max but still the thing go

I’ve been astonished at how bad the battery is in my base iPad I bought last year. Granted I’m switching to it from an iPhone 17 pro max but still the thing goes from 100% to 80% overnight without being used and a 40 minute Zwift ride routinely drains 15-20%. Makes me much more reluctant to buy another as it has to be tethered to a charger.