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.
Apple part number: 922-0750. The Rayovac 840 is a 4.5 Volt 650
mAh alkaline computer clock CMOS PRAM battery with a 7 inch wire harness
Berg-type connector and Velcro fastener. Note - the Rayovac 840 is now 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 is 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 use the Rayovac 840 battery to maintain the
computer clock and CMOS RAM information. Note: Alkaline clock batteries
including the Rayovac 840 can be shipped interstate via UPS ground or air
services plus USPS Priority Mail.
