This is the highest capacity 18650 cell currently available. The MJ1 is not intended for high current usage (like quadcopters or vapes) but for running goggles and other low drain accessories it's ideal, providing longer run time than any other cell on the market. These are premium, genuine cells. We have cycle and load tested cells from our batch and they will actually discharge their rated capacity of 3500mAh (3 tested - 3464,3518, 3489). There are lower cost, lower capacity and lesser quality options - we just chose to go with the best for our application.
Use caution as misusing or mishandling the battery may cause a FIRE or EXPLOSION which may result in personal injury or property damage. The user must have an appropriate understanding of the potential dangers of LITHIUM ION BATTERIES before purchase and usage. No express or implied guarantee of compatibility, suitability, or fitness for any particular purpose or device can be made. This battery is manufactured and sold for the intended use of system integrations with proper protection circuitry or battery packs with a BMS (battery management system) or PCB (circuit board/module). This battery is neither designed nor intended to be used with an E-CIGARETTE, VAPORIZER, or similar device. USAGE OF THIS BATTERY IS AT YOUR OWN RISK!