Have you tried the battery booster app such as Greenify..These apps hibernate misbehaving apps and save battery power while saving CPU. Technically, they work on both on both rooted and non-rooted devices. But, works better when grants system-level access. As this is the Samsung device, you can try Odin to get root access. I hope [https://autoroot.chainfire.eu|this website] and this guide ++https://odindownload.com/root-android++ would help you