Greenworks GMAX 40V System offers a wide range of easy to use tools for the homeowner and those who just want more power. This 14-inch cordless chainsaw features a high speed brushless motor that delivers superior power and performance. This unit is light weight and easy to use . automatic oiler with an oil view window . and side access chain tensioning. The 14″ .043 gauge bar and chain is suitable for medium to heavy duty applications. Compatible batteries currently include a 2 Ah (model 29462) and 4Ah (model 29472) battery and charger (model 29482). The 2Ah battery charges within 1 hour . so you can get back to work and finish the job. The 4 Ah battery charges within 2 hours.