12 V. Dewalt Cordless Drywall Screwdriver No. DW979 | eBay
DeWALT Cordless Screwdriver Repair - Replacing the Bit Holder (DeWALT Part # 619773-02) - YouTube
Synergy Digital Power Tool Battery, Compatible with DeWalt DW979 Power Tool, (Ni-MH, 12V, 3000mAh) Ultra High Capacity, Replacement for DeWalt DC9071, DE9037, DE9074, DE9075, DE9501, DW9071 Battery - Walmart.com