My Dyson battery died with the red blinking LED syndrome. I opened it to see what is in my Dyson Battery. The Dyson Battery uses 18650 lithium-ion rechargeable batteries.

Dyson vaccum cleaner Battery
Dyson vacuum cleaner Battery
The type is Dyson BP01 Battery Back, with 21.6V and 1080mAh for a total of 23.5Wh (watt hour)