Spare lithium batteries are not allowed in checked-in baggage. They must be carried as cabin luggage only.
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The rules for power banks with more capacity than 27,000mAh differ per airline. Power banks with a capacity of more than 43,000mAh can't go with you on the plane. Sometimes, power banks with a capacity between 27,000mAh and 43,000mAh may be taken onto a plane, but only in consultation with the airline.
Is your power bank allowed on the plane? Want to charge your smartphone or other device with a power bank during your flight? You're allowed to take power bank of up to 27,000mAh with you in your carry-on luggage.
The FAA goes into precise details about taking power banks on planes: any battery that you take on board should not exceed 100Wh. External chargers or power banks are also considered to be a battery, and should not surpass a capacity of 27000mAh, or in other words, 100Wh.
Lithium-ion (rechargeable) batteries and portable batteries that contain lithium-ion can only be packed in carry-on baggage. They're limited to a rating of 100 watt hours (Wh) per battery. With airline approval, you can bring two larger spare batteries (up to 160 Wh).
Maximum capacity: 100 Wh or 27000 mAh. Emirates — spare or extra batteries (including lithium and lithium-ion batteries) can only be carried in carry-on luggage. Items that mainly serve as an energy source (e.g. power banks), are considered spare batteries. There is a limit of 20 spare batteries per passenger.
For example, flyers often wonder if a 20000mah power bank is allowed on flight. As 20000mah makes for less than 100 watt-hours, it can be carried in cabin luggage.
Lithium-ion (rechargeable) batteries and portable batteries that contain lithium-ion can only be packed in carry-on baggage. They're limited to a rating of 100 watt hours (Wh) per battery. With airline approval, you can bring two larger spare batteries (up to 160 Wh).
Powerbanks restrictions are airline specific. Most allow only up to 10000mAh only in the carry-on luggage. You are not allowed to put them in your checked baggage. That being said, I have flown in and out of Singapore with power banks and had no issues either way.
Anker PowerCore+ 26800mAh PD 45W With 60-Watt PD Charger
This top-rated battery pack from Anker packs the most power you're allowed to take on a flight. It features a 45-watt USB-C port to charge your laptop back to full battery and 15-watt USB ports to charge smartphones and other small devices.
Checked Bags: NoWith airline approval, passengers may also carry up to two spare larger lithium ion batteries (101–160 Wh) or lithium metal batteries (2-8 grams). This size covers the larger after-market extended-life laptop computer batteries and some larger batteries used in professional audio/visual equipment.
The restrictions as per the Federal Aviation Administration are for lithium-ion batteries rated above “100 watt hours (Wh) per battery”. Anything above that limit is restricted. While that limit allows most power banks to be brought on flights, there are still consumer power banks that exceed that limit.