Cobra CS3540VZ cordless chain saw which uses a 4Ah lithium battery (not included). Fully charged the 40v battery can power the saw for up to 50 minutes. The chainsaw has 35cm guide bar and chain made by Oregon. Oregon is the world’s leading manufacturer of chainsaw bars and cutting chains. The lightweight, quieter alternative to a traditional petrol chainsaw the CS3540VZ has comfortable ergonomic controls and a safety chain brake.All the Cobra 40v cordless garden machinery uses the same lithium-ion battery and battery charger. The battery powered 40v range includes hand-propelled and self-propelled four wheel lawn mowers, rear roller lawn mowers and hand held garden tools including a line trimmer, hedge cutter and chainsaw.4Ah 40v lithium-ion battery and battery charger not supplied and available to purchase separatelySpecificationsModel: CS3540VZType: CordlessBar Length: 35cm / 14 inchOregon Bar and ChainChain Speed: 9.0 m/sSafety Chain Brake: YesQuick Chain Tensioner: YesRunning Time: Up to 50 minutesCharging Time: Approx 90 minutesNo Load Speed: 5000rpmWeight (incl a battery): 5.5kgWarranty: Manufacturer’s 2 year Battery and Charger Not Included