Charge for about 3 hours. Can be charged half a year once not used mobile phones, the battery will self-discharge, less electricity, too long will overdischarge. When the battery voltage is too low, the charging is slow, it will take half an hour or more, and the battery voltage is restored before it is charged normally. Infrequently used mobile phones must be fully charged in advance before shutting down so that his discharge speed is relatively slow
Three years of no charging mobile phone, if it is a new mobile phone has been sealed useless, it is probably normal charging, if it is fast charging, more than an hour or so will be full, if it is an old mobile phone, you put three years without charging then it will not be charged, which requires replacing the battery, and then charging.
It takes about 2-3 hours to charge, and most mobile phone batteries will be fully charged within this time period. When the phone battery is fully charged, there is no need to keep the phone in a charging state, and the charger should be unplugged in time, otherwise the charging time will cause damage to the battery.