18650 hand drill

I often use dremel foll small things and i hate taking it out from toolbox for 30s job.
I had DC engine from old RC boat and some spare 18650 from old laptop battery so I decided to combine them into small hand drill.
Links are just to show type, I ordered my items some time ago...

BOM:
1x 280 type DC engine (https://goo.gl/i3ZrLd)
2x 18650 batteries
1x mini drill chuck (https://goo.gl/J5sN43)
1x Endstop switch 20x10x6mm
1x M3x16mm
1x M3x25mm
1x M3 nut
1x rubber band
some cable that was laying around (isolation is 2.2mm thick
Also you will need some Dremel accessories if you dont have them already.

I updated 2nd version with cables hidden in slots. Strip cables about 1cm on the end and push them into holes. Rubber band will do the work pushing cap into batteries