Rechargeable lithium-ion 18650 battery Canwelum, Powerful 3.7V Li-ion 18650 battery, Reliable Li-ion 18650 battery with protection board and greater power capacity - Can be used for flashlights, not for E-cig (A set of 2 packs) (Electronics)
These batteries are relatively cheap and keep so far, what the promise. Also important: the fit (size) is true, which is not necessarily the case with many others. They provide a good and reliable alternative to low battery as "Ultra Fire" is wh