2-CELL BATTERY CHARGER 1200 mA - 2400mA PLUGGED = 100-240V ETC & 16340 & 8650 & 26650
These numbers typically represent the size codes of Lithium-Ion (Li-ion) rechargeable batteries. The format is usually like XXYYY:
XX: Diameter of the battery (mm).
YYY: Length of the battery (mm).
Sometimes the final "0" indicates the cylindrical shape.
According to this code, the characteristics of the batteries are as follows:
| Battery Code | Diameter (mm) | Length (mm) | Common Usage Areas |
| 16340 | 16 mm | 34 mm | Rechargeable version of CR123A battery (also known as RCR123A). Small flashlights, cameras, security systems. |
| 18650 | 18 mm | 65 mm | One of the most common Li-ion battery types today. Laptop batteries, high-power flashlights, electric vehicle battery packs (formerly), electronic cigarettes, portable power banks. |
| 26650 | 26 mm | 65 mm | Thicker and generally higher capacity compared to 18650. High-power flashlights, electric bicycles, some electric vehicle batteries, solar energy storage systems. |
