As battery technology advances, stores have to push the old systems off the shelves to make room for the new kings of cordless tools. Often a vigilant hunter can find sweet deals on perfectly good batteries and even a few chargers.
Don’t expect anyone to be giving away last year’s Li-Ion gear; instead look to the old Ni-Cad-powered gear for the best bargains. We spied these Task Force 12V packs marked down to $5 each — there were close to a dozen of them lying on the clearance table at the back of the store. We also found a charger setup for them, buried under a pile of gardening gloves, marked down to $9.
So even if you just wanted to repurpose the packs so they can power a creation of your own — like a giant robot — you could do so for less than $20.