2006.. all 3 of my 12v drill batteries died, I made a belt mounted leather hip pouch and drill holster, fitted a 1.2 metre curly cord to my drill, and utilised a 12v gel-cell sealed bike battery in right hand pouch for power, the holster on the left. (cross draw?) Left me with both hands free climbing ladders, etc (Sparky) Made a nice lightweight tool, without a battery fitted.
In construction, 3 fully charged batteries were sometimes required for a days work.
Never had the bike battery go flat during a days work, which often happened with all 3 Ni-cad batteries supplied.
The day I retired, one of the apprentices at work had a cordless drill failure, and I gave him my drill, belt, and charger.
(actually, he popped in for a coffee here a couple days ago, and informed me of the fact that He still uses it to this day, 5 years later.) ... it is now 8 years old! That damn battery has lasted longer than the one fitted to my bike!.