The al ko energy flex range of cordless gardening tools are all powered by a single 40v lithium ion battery. These 4ah batteries are fully rechargeable and offer all the power of a petrol machine but without the noise and exhaust fumes.battery powered garden machinery allows the operator full freedom of movement around the garden without any trailing electrical cables to cause a problem. The al ko energyflex cs 4030 chain saw would be ideal for occasional domestic use in the garden on low branches and logs. Cut the wood at home and keep your log store topped up without having to buy in logs. The 30cm bar is fitted with a high performance, durable oregon chain which is automatically kept lubricated as it runs. The chain oil tank has a viewing window so you can see when it needs topping up. User safety is ensured with the chain brake and hand protection bar with quick chain stop. Fully charged the cs4030 li cordless chain saw can operate for approx. 20 minutes depending on the cutting conditions.please note battery and charger not includedtechnical detailsmodel cs4030limotor battery poweredbattery type 40v 4ah lithium ion not includedbattery charge time 90 minutesoperating time approx 20 minutesbar length 30cmchain speed 16.3m ssaw chain oregon 3 8” 45ex91pxchain tension tool freechain lubrication automaticchain brake yesweight without battery 4.45kg manufacturer’s warranty 2 years for domestic use only