Changing these 6 settings on my iPad improved the battery life by hours
Briefly

Lowering the iPad’s screen brightness can provide over an hour of extra use per charge, while also reducing eye strain. Additionally, turning off location services for infrequently used apps is essential as it prevents unnecessary battery drain. It is advisable to manage settings judiciously to maximize battery life effectively, especially for users engaged in intensive content consumption and multiple app usage. Adjusting these settings can lead to improved longevity for each battery charge.
One of the first recommendations you'll hear from anyone offering tips on conserving your iPad's battery life is lowering your screen brightness, which can offer over an hour of extra use.
Turning off location services for apps that you don't use often is a good idea, as it prevents your iPad from working extra and draining battery unnecessarily.
Read at ZDNET
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