It is safe to say that you do not really need that much power left in your Galaxy S4 in order to download this over the air (OTA) update that weighs in at approximately 24MB in size, while bumping up the software version to build L720VPUAMDL. It is rather unfortunate that there is no changelog available for this particular update, so it is safe to assume that this particular update is a last minute patch for the smartphone’s software. Just in case you missed the notification of the software update on your Galaxy S4, you can always attempt a manual update by going to Settings > More > System Update.