WhatsApp for Samsung Galaxy S6 edge (CDMA)

On older S6 edge units the sealed battery has degraded and background apps add to the drain. Go to Settings > Device maintenance > Battery, tap into the app list, and set heavy apps to Sleeping or Deep sleeping. Turn off Always On Display and reduce Edge lighting and Edge panels under Settings > Display, since the curved AMOLED edge is a notable consumer. If the phone still dies within a few hours of a full charge, the battery itself is worn out and needs a professional replacement (it is not user-removable). See how others solved this on Reddit

The Galaxy S6 edge stopped receiving official Samsung and Android security patches years ago (it tops out at Android 7.0), so the OS itself can no longer be patched. Keep Google Play Protect enabled (open the Play Store, tap your profile icon > Play Protect > Settings) and keep individual apps updated from the Play Store. Avoid sideloading APKs from outside the store and consider removing banking or other sensitive apps. For ongoing OS-level security you would need a custom ROM such as LineageOS, which is an advanced route that voids the warranty. See how others solved this on Reddit

Sign in under Settings > Accounts > Google and turn on sync for Contacts. Then open the Google Photos app and enable Back up & sync so your gallery uploads to your Google account. For a full transfer to a newer phone, use Samsung Smart Switch (wireless or USB cable), which copies photos, messages, contacts, and apps in one pass. Once everything appears in Google Photos and Contacts on the new device, you can safely factory reset the S6 edge. See how others solved this on Reddit

Some warmth is normal, but persistent heat usually comes from a worn battery or heavy background processes. Close apps from the Recents view and check Settings > Device maintenance > Battery for misbehaving apps. Remove any thick case while charging, use the original Adaptive Fast Charging adapter, and avoid using the phone while it charges. If it becomes too hot to hold or the back/screen starts to bulge, stop using it immediately: a swollen battery is a safety hazard and the phone should be replaced or serviced. See how others solved this on Reddit

The S6 edge has fixed internal storage and no microSD slot, so it fills up quickly. Go to Settings > Device maintenance > Storage and use the Clean now option to clear cached and junk files. Back up photos and videos to Google Photos, then delete the local copies, and clear the cache for chat apps like WhatsApp whose media folders grow over time (Settings > Apps > the app > Storage > Clear cache). As a last resort, back up your data and factory reset to reclaim space lost to accumulated system clutter. See how others solved this on Reddit