Some Macintosh computers have a backup battery to maintain system settings, such as the date and time, when the computer is turned off . The battery may last up to five years. However, this varies due to the battery's shelf life, and usage patterns of the computer. The batteries used in Macintosh computers are lithium or alkaline, and are commonly 3.6 V to 4.5 V.
If your computer does not retain parameter RAM (PRAM) settings when it is turned off, this generally indicates that the battery needs to be changed. Some Macintosh models may display a black screen when you turn them on if the battery needs to be changed.
If you are uncomfortable changing the battery, an Apple Authorized Service Provider can install one for you.
Desktop Macintosh Computers
| Macintosh Model | Battery part no. |
Macintosh 128, 512K, 512Ke Macintosh Plus
(battery equivalents: Eveready 523-BP, Ray-O-Vac RPX-21, Duracell
PX-21, Panasonic PX-21) | 742-0003 |
| Macintosh SE 800K, Macintosh II (with leads) | 742-0009 |
| Macintosh II with 600-0530 Battery Holder Board | 922-4542 |
| Macintosh SE FDHD (with leads) | 922-4542 |
| Macintosh Classic (4-chip and 2-chip) | 922-4542 |
| Macintosh SE/30, IIx, IIcx, IIci, IIfx, IIsi | 922-4542 |
| Macintosh IIvi, IIvx, Performa 600 | 922-4542 |
| Macintosh LC, LC II, LC III, Performa 400 series | 922-4542 |
| Macintosh Quadra 605, LC 475, Performa 475, 476 | 922-4542 |
| Macintosh LC 520, LC 550, Performa 550 | 922-4542 (Note 1) |
| Macintosh LC 575, Performa 575, 577, 578, 580 | 922-0750 |
| Macintosh Classic II, Color Classic, Performa 200 | 922-4542 (Note 1) |
| Macintosh 630 Family including Quadra, LC, Performa | 922-0750 |
| Macintosh Centris 610, 650, 660AV | 922-4542 |
| Macintosh Quadra 610, 660AV, 650, 700, 800, 840AV, 900, 950 | 922-4542 |
| Power Macintosh and Performa 5200, 5300, 5400, 5500, 6200, 6300, 6400, and 6500 series computers; Twentieth Anniversary Macintosh | 922-0750 |
| Power Macintosh 6100/60, 6100/66, 7100/66, 8100/80, Performa 6100 series | 922-4542 |
| Power Macintosh 7100/80, 7200 series, 7300 series, 7500 series, 7600 series, 8100/100, 8100/110, 8500 series, 8600 series, 9500 series, and 9600 series. | 922-1262 |
| Battery part number | Type | Voltage |
| 742-0003 | Alkaline | 4.5 V |
| 742-0009 | Lithium |
| 922-0750 | Alkaline | 4.5 V |
| 922-1262 | Lithium | 3.6 V |
Portable And PowerBook Computers
| Portable/PowerBook Model | System Battery | Backup Battery |
| Portable, Backlit Portable (Note 7) | 076-0376 | 9 V Alkaline |
| PowerBook 100 (Note 7) | 661-0782 | CR-2430 (quantity 3) |
| PowerBook 140, 145, 170 | 661-0754 | 661-0724 |
| PowerBook 150 | 661-0013 | 661-0190 |
| PowerBook 160, 180 | 661-0789 | 661-0750 |
| PowerBook 165c | 661-0013 | 661-0764 |
| PowerBook 180c | 661-0013 | 661-0685 |
| PowerBook 190 series (Note 2) | 661-1028 | 922-1418 |
| PowerBook Duo 200 series (Note 3) | 661-0053 | 630-6546 |
| PowerBook 500 series (Note 4) | 661-0055 | 922-0786 |
| PowerBook 1400 series (Note 5) | 922-2420 | 922-2429 |
| PowerBook Duo 2300 | 661-0053 | 630-6546 |
| PowerBook 2400 | 922-3076 |
| PowerBook 3400 | 922-2471 | 922-2692 |
| PowerBook 5300 series (Note 6) | 661-1028 | 922-1418 |
Notes
1. The Color Classic, Macintosh LC 520, and LC/Performa 550 logic boards may also use part 922-0750. Your Apple Authorized Service Provider can determine which battery should be used.
2. Includes the PowerBook 190 and 190cs.
3. Includes the PowerBook Duo 210, 230, 250, 270c, 280, and 280c.
4. Includes the PowerBook 520, 520c, 540, 540c, and 550 (550 sold in Japan only).
5. Includes the PowerBook 1400c and 1400cs.
6. Includes the PowerBook 5300, 5300c, 5300ce, and 5300cs.
7. Batteries for the Macintosh Portable and PowerBook 100 that measure less than 5.4 V are likely sulfated and unusable.
8. The Nickel Cadmium, Nickel Metal Hydride, and the Lithium Ion system batteries can usually be recharged even from a deep discharge. For battery identification, refer to document 16168: "
PowerBook: Battery, Recharger, & AC Adapter Identification".