The new Galaxy Z Fold 3 and Galaxy Z Flip 3 include a suite of new changes and features, as well as the latest version of Samsung’s One UI launcher. Chief among these features is the Protect Battery option, which SamMobile reports will limit charging of the phone’s battery to 85% each time it is plugged in.
Samsung
The Protect Battery feature is meant to do exactly that—protect the battery. By only charging it to 85%, the battery will ultimately last longer, as battery life deteriorates with every full charging cycle—recharging the battery to 100% of its total capacity.