If you have a cordless drill with NiCd battery pack, this video is for you. Because NiCd batteries do not long last. Whereas, we can not buy LiIon battery to replace NiCd battery for this particular drill. So, I removed the NiCd battery from my drill and attached a cord to connect to the 12V DC socket. Now on, I can use my drill for long hours without power interruption.