How do i make those keyless chuck from cordless drill to hold the bits better?

with normal drills with keyed chuck is ok but mine only has 1 speed and it's way too fast and way too powerful that heats up the bit too fast. so i use cordless drill which has slower speed, but the chuck just don't hold the bit well. if i am drilling harder stuff, the drill bit will get stuck not... show more with normal drills with keyed chuck is ok but mine only has 1 speed and it's way too fast and way too powerful that heats up the bit too fast. so i use cordless drill which has slower speed, but the chuck just don't hold the bit well.

if i am drilling harder stuff, the drill bit will get stuck not turning while the drill keeps on turning, especially on smaller drill bit. how do i make it hold tighter?
4 answers 4