According to the current information, 66W fast charger can charge iQOO 5. The iQOO 5 supports a wired fast charge of up to 55W, so charging with a 66W charger should have no negative impact. However, since the iQOO 5's official specifications are for a maximum 55W charge, using a higher power charger can cause overheating or other potential problems, so it is recommended to use an officially recommended charger or a charger with a similar power for charging. If you have any questions, it is best to consult the iQOO official customer service or consult the relevant instructions.
Charging the iQOO 5 with a 66W fast charger will not have any negative effects. The iQOO 5 supports up to 55W fast charge technology, while the 66W charger only provides a higher power output, but the device will adjust according to its own charging needs, and will not exceed the maximum charging power supported by the device. As a result, charging the iQOO 5 with a 66W fast charger allows for a faster full charge and does not have any negative impact on the device's battery life or performance.