The big advantage is freedom to move. There's no power lead to run every time you change position, which can mean quicker setup and fewer trailing cables around the work area. That's particularly useful on larger sites, at height and anywhere access to power is awkward.

There's no single answer, as runtime changes with the tool, battery capacity and nature of the work involved. Continuous heavy use will obviously drain a battery much faster than occasional lighter work. For longer jobs, having charged batteries ready to swap can help avoid unnecessary downtime.

A lot more than drilling and screwdriving. Battery-powered tools are now used for cutting, grinding, fixing, concrete and compaction work - alongside many other construction and maintenance jobs.

Yes, and that's one of their key advantages. It can make moving around and setting up easier ands safer.

For many jobs, cordless equipment can be a practical alternative - particularly when mobility matters. As always, though, the answer comes down to the task, workload and access to power rather than one power source always being better than the other.