Designed for powering cellular phone memory that uses a real-time clock, the ML614 Li-MnO2 coin cell is recharged from the main phone battery. It is not consumer replaceable and is said to last the full life of the phone. The cell measures 6.8 mm in diameter and 1.4 mm high and weighs 0.16g. Producing 3V with a nominal capacity of 4 mAh, the coin cell is capable of handling up to 1,500 shallow-charge and -discharge cycles and has an operating temperature range of from -20°C to 60°C. Price is $1.50 each. MAXELL CORP., Fair Lawn, NJ (201) 794-5900.