I leave my phone screen side down at night so it doesn't wake me when the battery reaches a full charge. This has worked for me without fail. I noticed this morning that when I pull it off of the charger from face down it only charges to 99%. When I charge it face side up it goes to 100%. I just thought it was interesting and wondered if this would be the case for others. I like that it doesn't have the battery charged pop-up when it charges face down.