A replacement battery for your fiberflies pixelwhip. This is an 18650 battery with a protection circuit on it. This battery has a capacity of 3000mAh, compared to the stock pixelwhip battery which has 2400mAh, so it should even glow a bit longer! Please bear in mind, batteries without the correct protection circuit will not work in your pixelwhip even if it is an 18650 format