I suggest the Y5 battery saver app which keeps WiFi turned off except when you are in a location where you connected with WiFi before.
HZutils is an app I wrote to get to the two menus mentioned in posts above. I like it so I don't need to remember the strange numbers for the menus. the app also has advertisements near the bottoms. if you click on an ad, it opens a web browser where you can read more about the product or service. and I get a few cents.
as suggested, look at what is using your battery the most. for me the display uses the most battery power.