How much is the battery?

It may be more cost effective to purchase the kit version of the chainsaw which comes with batteries and a charger, link below.https://www.toolnut.com/dewalt-dccs620p1-20v-max-compact-cordless-chainsaw-kit.htmlOtherwise, batteries are available separately, see link below.https://www.toolnut.com/power-tools/cordless-tools/batteries-chargers/batteries.html?manufacturer=DeWalt&tn_battery_voltage=20+V