If you decide to get a cordless drill, here's a tip to get the most life out
of your batteries:

When you detect the speed of the drill slowing down, an indication that the
battery has discharged, stop using the drill immediately. Swap batteries and
put the discharged one in the charger.

Running batteries completely flat causes the cells to heat up. Batteries
don't like heat, and will decrease their life if heated up regularly.

Good luck,
--
John English