What does this mean 6600mAh 71Wh?

The specification 6600mAh 71Wh refers to the capacity and energy of a battery. The 6600mAh (milliampere-hour) indicates how much charge the battery can hold, meaning it can provide 6600 milliamperes of current for one hour. The 71Wh (watt-hour) indicates the total energy capacity of the battery, representing the ability to provide 71 watts of power for one hour. Together, these figures help determine how long a device can operate on a single charge.