Generally, the charging voltage and current of a mobile phone charger are 5V- 1A (or 1-4A). If the charger parameters of other brands meet 5V, 1-2A, it can be charged. It is best to choose a special charger for lithium-ion batteries, otherwise it may not reach saturation state and affect performance. However, for the safety and normal use of mobile phones, it is recommended to use standard chargers.

This answer applies to all OPPO models.