Dangerous goods policy - Emirates

What the official page says

Batteries, spare or loose, including lithium-metal or lithium-ion cells or batteries for portable electronic devices, must be carried in carry-on baggage only. These batteries must be individually protected to avoid short-circuiting. Each passenger is limited to a maximum of 20 spare batteries. Lithium batteries, spare or loose ... with ratings of at least 100 watt-hours but not exceeding 160 watt-hours ... Maximum of two spare batteries in carry-on baggage only. Power banks: Usage of power banks to charge any electronic devices on board and charging the power bank itself using the onboard power source is prohibited. Passengers are allowed to carry one power bank with a maximum capacity of 100 watt-hour, with the power bank containing clearly visible capacity rating information. Power banks are permitted in cabin baggage only and not in checked-in baggage. On board the aircraft, power banks cannot be placed in the overhead compartment and must be securely placed either in the seat pocket or under the seat in front of you. Each passenger is limited to a maximum of 15 personal electronic devices.