4.5 Volt Alkaline CMOS/PRAM Battery - February 3, 2009 - Rayovac announced that the 840 has been discontinued and will no longer be produced beyond June 2009. Epower2go will continue to sell existing stocks until they are gone. After that time, we will provide a form-and-function equivalent, the Epower2go 840.
Apple part number: 922-0750. The Epower2go 840 is a 4.5 Volt 950 mAh alkaline computer clock CMOS PRAM battery with a 7 inch wire harness Berg-type connector and Velcro fastener. Note - the Rayovac 840 was made using machine assembled cases. The manufacturer logo and identifying markings are embossed onto a solid plastic case. Older Rayovac 840 batteries use a paper label and have not been manufactured since 1997. The Rayovac 840 battery replaced the Rayovac 841 battery (3 inch wire harness in 2003 and can be used to replace the Rayovac 844 battery (same voltage but lower capacity).
The Rayovac 840 battery was typically used in Macintosh Performa desktop systems plus the clones made by Motorola (StarMax and UMax) as a PRAM retention battery. Many types of IBM desktop systems including those made by Hewlett-Packard, Compaq and Dell used the Rayovac 840 battery to maintain the computer clock and CMOS RAM information.
Note: Alkaline clock batteries including the Epower2go 840 can be shipped interstate via UPS ground or air services plus USPS Priority Mail.
