Most 12-volt models have 10mm keyless chucks, but some have 13mm ones.
Keyless chucks are easier, because there's less fiddling involved.
Do not clamp the machine body in a vice.
Harder materials and larger bits require working at a lower speed.
Ensure power tools are used with the correct shield, guard, or attachments, recommended by the manufacturer.
Tape a penlight to the casing of your drill - you can then see exactly where you are even if it's dark.
The power of a cordless drill is proportional to the voltage (approximately), the voltage is also proportional to the weight (approximately).
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