The Nitecore NL1835R is an innovative 18650 battery with an integrated micro-USB charging port and a capacity of 3500mAh. The battery is self-contained, eliminating the need for a separate charger as a micro USB cable can be plugged directly into the cell itself. The battery has a built-in power indicator which activates when it is being charged. The light is red when charging and turns green once the battery is fully charged. The NL1835R has a range of safety features. Internally the battery features pressure relief protection which activates if the temperature rapidly increases, a microporous barrier which protects the internal components, an integrated smart charging circuitry in the anode to protect against over-charging, over-discharging and short circuiting, plus a built-in PTC inhibiting high current surges. Externally, the battery is equipped with a gold plated, stainless steel protector which ensures high impact resistance, good electrical conductivity and oxidation resistance.