Check the listing for details. AA Size Dummy Battery qty 4- shorted slug - short circuit- reduce voltage- 4 pc. Condition: New. Listed at 29.95 USD. This listing is for a 4 pack ( 4 pieces / 4 cells ) Size of a standard AA battery, this shorted Dummy Cell fits in any standard AA battery tray (holder/compartment) and is used to complete the circuit when it is desired to run on fewer cells than the tray is designed for. This is the case in many products that were designed for Ni-Cad or Ni-MH cells (1.25V each) and your are replacing with Alkaline or Lithium or Li-poly cells that have an inherently higher voltage (1.7V+). Put a Dummy Cell in place of a battery and run the proper voltage. Depending on the total number of batteries and their voltages you may need more than one Dummy Cell to obtain the desired operating voltage. We'll leave the math to you, but a Dummy Cell is 0 Volts. Nickel plated copper contacts ensure excellent conductivity for corrosion-free, reliable operation. These units are brand new and designed by us (this seller) in the USA and manufactured in the USA. See our feedback and buy with confidence. Posted with eBay Mobile