Install 18650 lithium batteries of the word 'construction project' what meaning be?

We often use the solar street lights and solar garden lamp lithium batteries batteries generally is 18650, what these Numbers mean? Simple said these figures represent the batteries is cylindrical lithium-ion batteries, 18 on behalf of the batteries is 18 mm in diameter, 6

solar street lights and solar garden light battery is usually 18650. What these Numbers mean? In short, these Numbers mean that the battery is cylindrical lithium-ion batteries, 18 means the battery is 18 mm in diameter, mean length of 65 650. 0 mm, corresponding battery capacity is 2800 mah. Accordingly, our solar street lights and solar garden lamp manufacturers rarely used 26650 is cylindrical, the battery is 26 mm in diameter, length of 65 battery. 0 mm, its corresponding battery capacity of 5000 mah.