1C is usually not 1hr from empty to fully charged, because of CC-CV charging. Most Li based chemistries charge at 1C until a certain threshold (when the needed

1C is usually not 1hr from empty to fully charged, because of CC-CV charging. Most Li based chemistries charge at 1C until a certain threshold (when the needed voltage for 1C charging reaches a maximum predetermined level, usually the target max cell level, e.g. 4.2V). After that, you charge at constant voltage until you reach full charge. If the battery is significantly oversized, i.e. it treats 85% charge as 100% for the user, then 1C might be possible from 0 to 100%, but usually it's not.