This multi-tool could be useful for both big and small projects. There's no cord to restrict you, just make sure you've charged the battery.
From Amazon
DEWALT DCS356NT-XJ Multi-herramienta Oscilante sin escobillas XR 18V sin cargador/batería
Toolstop
Dewalt DCS356NT 18V XR Brushless Oscillating Multi Tool Body Only