When you're about to take on a new project you can always find use for an impact wrench. It runs on compressed air, so no need for charging.
From Amazon
Aerotec Impact Wrench Compressed Air CSP 1200 1200Nm/1/2 Inch/Composite - 2010197
Conrad Electronic
Aerotec CSP 1200 2010197 Pneumatic impact driver Tool holder: 1/2 (12.5 mm) male square Torque (max.): 1200 Nm