Estimated life expectancy for the Alkaline battery in an Apple computer
Note: The following battery life estimates are for the Rayovac 4.5 V, 600mAh, Alkaline battery, Apple p/n 922-0750.)
| AC power on hrs/wk | Est. Lifetime Yrs. (+/- 0.5Yr.)* |
| 0 -40 | 2.0 |
| 40-80 | 2.5 |
| 80 + | 3.5 |
| * This table refers to the worst case situation, i.e. AC is not present when the computer is not being used - regardless of the type of computer, therefore, if AC is present and the appropriate tips below are followed, the battery life will exceed the estimations above. |
Other causes of battery drain:
Shutting off the AC power switch or removing the AC power causes a small, but continuous drain of the computer battery to occur. This is because the battery backs up certain system information and takes a small but measurable amount of power to accomplish this.
Tips on prolonging the life of your Alkaline battery:
- When shutting down the computer, make sure to use the shutdown option under the special menu or power-key invoked shutdown command.
- Keeping the power switch, if your computer has one, in the on position will prolong the battery life, however, keeping it in the on position leaves the system vulnerable to power surges, so if you are concerned about power surges, switch the power switch to the off position.
- If the computer is to be put into storage or if the power cord is to be removed for a long period of time, disconnect the battery from the logic board.