Don't you hate searching for replacements, not finding any at a reasonable cost, so you move on to customizing and then this pops up.

10 x NiCd 4/5 SubC 1.2V 1600mAh
Rechargeable Battery with Tab Blue
$16.16USD

http://m.ebay.ca/itm/130807945134

So I could bring life back to all 3 screwdrivers for just over $17 Canadian.

Robert