Brand: Samsung
Size: 21700
Approximate Diameter: 21.1mm (max)
Approximate Length: 70.4mm (max)
Manufacturer Rated Capacity: 4000mAh
Manufacturer Rated Standard Discharge Capacity: 3900mAh
Manufacturer Rated Max Discharge Current: 30A
Nominal Voltage: 3.6V
Peak Voltage: 4.2V
Protected: NO
Style: Flat Top
You can read Mooch's test report on this battery here
External batteries are recommended to be charged via external battery chargers.
Each battery is sold individually and due to AusPost regulations, these can not be shipped Express Post. If you select Express Post, it'll still go out Regular Parcel Post; if you've got multiple items in your order, everything except the batteries will go Express Post.
Please practice battery safety and read up on how to store, transport and charge your batteries.