A battery holder or a battery connector or a button battery holder is an integrated or separate cavity to hold batteries and coin cells. It is low-cost and reliable and can be easily taped, glued, soldered, or bolted to a project or soldered to a PCB. A button battery holder adapted to be inserted into electronic equipment is disclosed. The primary function of a battery holder is to keep cells fixed in place safely and securely while supplying current from the coin cells to the connected device.