98% of all sellers and manufacturers of after market batteries for Makita, Dewalt, Milwaukee, Rigid, Ryobi, Bosch, Skil, stanley, and many other secondary market, fake or counterfeits lie about their capacity and capabilities.
The biggest lie is the milliamp hour or amp hour rating. They exaggerate the capacity by as much as 300%.
If you see a cheap battery and it is rated at 4ah or 4000mah it will often be 2000 to 3000mah. If it is 6ah it could be 3 or 4ah. I have never seen an after market non OEM battery with a capacity higher than 4ah.
18650 batteries are expensive even if you buy them in bulk.
The second biggest lie is that they have cell balancing, or over discharge protection. Assume that they do not.
There is also a large amount of counterfeit batteries. See you tools manufacturer website for information on how to spot them.
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