These aren't quite as torquey as the other types (but it's RPM which matters most anyway for drilling). Upside is they don't have any hoses or cables to get tangled with and don't run at mains voltages (check if waterproof before getting too cocky).

• Cutting siezed shafts.

• Cutting into nuts.

• Removing heads.

• Cycles are the key 20,000 per minute or better.

• Get additional battery packs.

• Buy a rapid charger.

• Always wear eye protection

• Consider impact protecting gloves