Involvement:Expert (understands the inner workings) - Ownership:more than 1 month
Consumers have a difficult time keeping up with the ever-changing battery size terms. Most consumers are familiar with the omnipresent A, AA, and AAA battery sizes, but many of the same consumers do not understand the meaning of other battery size terms, such as the 18650. Manufacturers produce the lithium ion 18650 at a size of 18 mm by 65 mm. Consumers may find a "D" at the end of every 18650, which denotes the shape of the battery
Newer 18650s possess a protection circuit that adds additional length to the battery. Labels and packaging also alter the size of 18650s, adding further confusion to the way consumers can use the battery. Despite the inconsistencies, manufacturers are working to implement uniform production standards to mitigate size confusion. In the near future, consumers can expect a uniform manufacturing standard for 18650 batteries.
Where long lifetime,with my ultrafire 501B flashlight it wwos about 1,5 hour.
Have a lot of mah,witch iprove long life
i re-charge these batteries till now about 100 time and works like new one and today.
Good price - good choise
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