I have one of these, but use it very rarely, only when there is limited access. It has low torque, so it's really only good after the bolt has been broken away (not counting valve cover bolts and similar). You can turn it manually obviously.
My real go-to cordless tools are my brushless 18V Makita set - driver drill for light stuff (screws, interior); impact driver for most other fasteners; and the impact wrench that's good to over 200 ft-lbs. They make quick work of removing fasteners, and the batteries last forever.
It's kinda sad that my nice Snap-On ratchets are sitting in the drawer most of the time because of these cordless tools, so I try to be nice to them and take them out when it's time to tighten the fasteners.