SYMPTOM

* Monitor does not come on immediately.
* Date and time have to be reset each time computer is booted.
* Chooser settings have to be reset each time computer is booted.

SOLUTION

Replace Macintosh system PRAM battery.

• How to tell if your battery needs replacing
• Where do I find the Battery in my Mac ?

About the Mac PRAM Battery

PRAM stands for Parameter RAM. The Parameter RAM is a portion of RAM that keeps track of things like your clock's information and control panel settings. Some settings stored in the PRAM include: settings in the Monitors control panel, the Time and Date control panel, the General Settings control panel, the AppleTalk control panel, and the Startup Disk control panel. When the computer does not retain PRAM settings (such as the date and time) after it has been turned off, this generally indicates a dead battery. Some Macintosh models, such as the Power Macintosh 7100 and the Quadra 605, display a black screen when the battery has failed and the computer is turned on. Where do I find the Battery in my Mac ?

Mac 3.6v Round PRAM Battery 1/2AA - 24 Euro + *Shipping costs

- I buy batteries from a several sources so the brand pictured may not be the brand you receive.

Use this quality CMOS PRAM/Clock Backup Battery when you need to replace the battery in your Apple computer. New 3.6v Mac PRAM/Clock Backup Battery, round LITHIUM 1/2AA battery, high-current drain. The Apple part number is: 922-1262. This battery is NEW but not blister packed, comes in a plastic bag. All batteries are tested prior to shipping. Buy now!

This Battery will work in the following systems:

SE/30, IIx, IIcx, IIci, IIfx, IIsi
Mac IIvi, IIvx, Performa 600
LC, LC II, LC III
Performa 400 series
Quadra 605, LC 475
Performa 475, 476
Centris 610, 650, 660AV
Quadra 610,660AV,650,700,800,840AV,900,950
PowerMac 6100, 7100, 8100
PowerMac 7200, 7300, 7500 and 7600 series
PowerMac 8500, 8600, 9500 and 9600 series
PowerMac G3(Desktop, MiniTower, All-in-One)
PowerMac G3 (Blue and White)
PowerMac G4 (PCI Graphics)
All iMac Models
The Color Classic, Macintosh LC 520, and LC/Performa 550 early production logic boards used this battery. They were later revised to use the 4.5v Alkaline Square battery below. You will need to check your Mac to determine which battery should be used.

PC133A 4.5 Volt Alkaline A Cell - for the early Macintosh - 24 Euro

The PC133A is an 4.5 Volt alkaline A cell. I buy batteries from a several sources so the brand pictured may not be the brand you receive. Buy now!

This Battery will work in the following systems:

• Mac 128K,
• 512K,
• 512Ke
• Mac Plus

Mac 4.5v Square PRAM Battery- 35 Euro + *Shipping costs

- Click for bigger view - I buy batteries from a several sources so the brand pictured may not be the brand you receive.

New 4.5v Mac PRAM/Clock Backup Battery. The Rayovac 841 is a 4.5 Volt, 650 mAh alkaline computer clock PRAM battery with 3 inch wire lead, Berg-type connector and Velcro patch. This device replaced the 840 for use in Macintosh systems beginning in 1999. The Apple part number is 922-0750. This is the Rayovac Alkaline square style battery that attaches with velcro and has a 2 wire connector. This battery is not blister packed, comes in plastic bag.

This Battery will work in the following systems:

Classic II
LC 575, Performa 575, 577, 578
LC/Performa/Quadra 630 series
Performa 640CD DOS Compatible
PowerMac 4400
PowerMac & Performa 5200,5300,5400,5500 series
PowerMac & Performa 6200,6300,6400,6500 series
Twentieth Anniversary Macintosh
The Color Classic, Macintosh LC 520, and LC/Performa 550 logic boards were revised to use this battery. Early production units used the 3.6v round 1/2AA lithium battery above. You will need to check your Mac to determine which battery should be used.