Mac powerbook g4 power supply
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Broken Apple Power adapter or Apple power supply?
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No rechargeable batteries last forever. Calibrate the Battery New Apple batteries, those included with a machine and those bought separately, arrive partially charged and need to be calibrated. This procedure provides a baseline for the processor built into the battery, so the processor can effectively regulate power consumption.
To calibrate your battery, first plug in the laptop and charge the battery to percent capacity; the light at the end of the Apple-supplied power cable will go from orange to green when the battery is fully charged.
Next, unplug the power adapter and let the battery run down. The machine will put itself to sleep and refuse to wake up. Plug the adapter in again and fully recharge the battery. You can use the laptop as you normally would during the calibration process.
You need to calibrate the battery only once. When your laptop is running on battery power, use the Energy Saver preference pane to minimize performance and maximize battery life. Instead, charge the battery to about 40 or 50 percent capacity and shut the computer down.
Replacement Apple PowerBook G4 65W V A AC Adapter | SFCable
How you charge the battery is just as important as how you discharge it. Current iBooks and PowerBooks ship with a watt AC adapter that powers the machine and recharges the battery. It includes a car adapter for charging on the road, and it features several plug tips that allow the power supply to work with other laptop models. Even if you usually use an AC adapter, make a point of working from the battery once a month and then recharging.
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Try to complete a full charge-and-discharge cycle at least once per month. According to Apple, a lithium-ion battery should retain 80 percent of its original capacity after full charge-and-discharge cycles. Its lithium-ion battery registered an embarrassing 1 hour and 21 minutes of life with the Energy Saver options set to Longest Battery Life. A replacement battery from BTI clocked in with a more respectable 3 hours and 57 minutes.
Nearly all battery and computer vendors sell replacement batteries for current models. To be competitive, some companies offer higher-capacity batteries that benefit from improvements in battery technology since the original models were introduced. For some frequent travelers, this type of device my be preferable to juggling multiple battery packs, though it adds about three pounds to your bag.