panasonic ez503/ey503 battery case

let old screw-driver to use 18650 lithium-ion battery,
the battery output must be large then 20A or don't work.
18650 battery case is normal to buy on web, size is 75.6 x 21.5 x 20(mm),
use battery case then no necessary to weld battery.
use hot-melt to assembly all parts.
good luck and forgive my poor English , thank you.