A:Answer With Li-ion batteries it is best to remove from the charger at 100%. Depending on what you're charging with. The Li-ion batteries also SHOULD NOT be completely discharged. This shortens their life and can cause dangerously high heat levels when re-charging. Li-ion batteries work best if you keep the charge between 30% and 90-100%. Also you should not charge them when very cold. (near freezing) If you leave your phone in your car in a freezing climate don't leave it in a wireless charger, if your car has one, until you have warmed the car up. I am not a chemical engineer, but I got these guidelines from someone who was an originator of Li-ion battery manufacture. Failure to watch out for these extremes is why Li-ion batteries catch fire or violently discharge their energy if they internally short. He started 2 companies that made the Li-ion batteries and knows all about them. This information pertains to ALL Li-ion batteries not just Samsung note 7's or Apple products.
BJB