Chiseled for 20-mm diameter batteries, the BK-913 retainer offers a 23% narrower width than comparable designs and weighs 0.8 grams. The retainer has two PC pins and is made of nickel-plated phosphor bronze. It employs dual pressure contacts that offer low electrical resistance and are optimized to keep a tight connection with the battery. Shock and vibration resistant per EIA-364, batteries are easily changed without tools or instructions. Priced is $0.12 each/10,000. MEMORY PROTECTION DEVICES INC., Farmingdale, NY (631) 249-0001.