So a few power tool makes portable backpack battery to extend runtime and put the weight of the batteries on your back.
Ex 1: Makita PDC1200 https://www.makita.co.nz/products/model/PDC1200
Ex 2: Husqvarna BLi520X 36-Volt 14.4AH 520Wh
Ex 3: STIHL AR 1000 36-volt Backpack Battery
Ex 4: Hitachi...