Lithium-ion battery 18650 1c, 3.7v, 1800mah.
The 18650 battery is one of the most widely produced lithium-ion battery types as it is found in laptops, power-tools, robots, electric vehicles, vaporizers, solar grids, and almost any application you can think of that desires to store electrical energy more efficiently.
Advantages-
high energy density
low maintenance.
Smaller and lighter.
Quick charging.
Longer lifespan.