Yes, but the original is faster
Can be used, mobile phone charger charging voltage, current is generally 5V-1A (or 1--4A), if other brand charger parameters meet 5V, 1-2A, it can be charged. Lithium-ion battery is best to use a dedicated charger, otherwise it may not reach the saturation state, affecting its performance, but for the sake of mobile phone safety and normal use, it is recommended to use a standard charger. This answer applies to all OPPO models.