Some more battery-saving tips
Apart from disabling unwanted apps and services, there are other things you can do to save on battery life. Optimise device and app settings. Minimise the number of apps you need to have. One RSS feed reader app can eliminate several dedicated apps. If a site offers RSS feeds, use the RSS feed instead of its app. Browse anonymously. Turn off services such as mobile data, Wi-Fi and GPS when they are not required. Turn off your phone when you are travelling because it will waste more energy trying to connect to transient cell towers. Enable the Ethernet networking option in Android tablets. Use a USB LAN adapter with your OTG cable so that you can use a wired connection. Yes, use a LAN cable. Disable Wi-Fi in your router and enable Airplane Mode in the tablet. This option is not available on Android phones as, of course, they do not have Ethernet drivers. Finally, a security tip: Do not let your phone connect to any free Wi-Fi access point. Wi-Fi routers get infected with viruses and are now a favourite hacking method. Botnets work because of compromised routers. You could instead rely on a mobile data plan and use it only when necessary.