Fogstar Energy 4000 21700 Battery

Fogstar will be phasing out the 18650 and 21700 range as we expand into other areas of advanced energy storage. These products will remain available during the transition period, while current stock lasts.

• Manufacturer: Fogstar
• Model: FS4000
• Size: 21700
• Capacity: 4000mAh
• Maximum Discharge: 40A
• Nominal Voltage: 3.6V
• Maximum Voltage: 4.2V
• Top: Flat-Top
• Protection: None

Supporting documents are available upon request (UN38.3, Specification Reports & MSDS)

Lithium-Ion batteries should never be kept loose in your pocket or purse. Always use the case provided.

• Lithium-Ion cells should be charged on a dedicated charger rated specifically for Lithium-Ion cells. Our selection can be found here.
• Never leave a battery unattended whilst charging. 
• Keep away from animals and children.
• Wraps and insulators should be periodically inspected for tears or damage. If a battery has a damaged wrap, it should be repaired or disposed of immediately. Wraps and insulators can be found here
• If you are re-selling these cells, it is your duty to pass these warnings onto your customers.
• Batteries usually have a cycle life of between 200-500 cycles (varies with manufacturer) before noticeable capacity drop off. Batteries should be recycled at this time.
• Do not crush, incinerate or modify.
• Only use within manufacturers specification.