18650 Protected Button Top Batteries

Protected Button Top Batteries are usually required for Torches, Lasers and other electronics where an onboard battery management system is not present. These batteries are longer than standard 18650's due to an inbuilt low voltage circuit at the bottom and a button top connection at the top. This stops the over charge/discharge of the battery, something that renders a typical unprotected battery unable to be recharged, once the voltage is drained beyond 2.5V.