I have the same product but lost my charger! Found this URL: http://www.northerntool.com/shop/tools/product_53130_53130 Performed a Chat Now, and talked with Part Department...and neither of them would commit themselves to say their battery (18V-1.2ah) would be a compatible substitute for our 18V-1.7ah battery. If they don't bat for us, then I wouldn't go further to ask to buy their charger to go with their battery (total replacement). If you are willing to risk you limb for a total replacement route, let me know the result...before I commit myself...otherwise I will just junk my tool kit, or donate it. Good Luck!