Ive had this flashlight for awhile, it was my first step graduating from mag-lights. haha..so anyways I liked it so much I purchased a friend one too who wanted mine. Well I think we both overcharged our batteries and fried them, cause both lights barely take a charge, and dont make me giggle with their illumination any longer. Heres a link to the light http://buy1.snapon.com/catalog/item...&group_ID=1113&store=snapon-store&dir=catalog Its a 4.8v zenon bulb and the battery appears to be of the 4 cells held together with plastic variety. it states on the battery: 2/3A Ni-MHX4 900 mah 4.8v. My question is, can I use the 18650s, or 123s that are rechargeable with this? The diameter looks right, little over half inch, about 4.5" long. If not Id appreciate suggestions for a good quality battery replacement with all the mahs I can get. Deciding what new fenix to get, and im just giong to buy a charger and batteries all at once, so I thought I might fix these lights for my friend and I, thank you.