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completely cutting of power reduces iMac lithium battery life?

Message #1 - Posted 2005/09/25 - Georg Schwarz

I have been told that completely cutting off the power (via a mechanical switch) to an iMac G5 during non-usage times could reduce the liftime of the build-in lithium battery. Is that true? Can I find a statement from Apple on that issue or any advice pro or against completely cutting off power?

Georg Schwarz http://home.pages.de/~schwarz/ georg.schwarz@freenet.de +49 178 8545053

Message #2 - Posted 2005/09/25 - P M Evans

As I understand it, with the computer shut down but still connected to a live power source you have a trickle of energy going in to maintain the PRAM settings. When you kill that power source, the PRAM battery kicks in to maintain the settings. The longer itπs shut down, the more the battery drains, and itπs not a rechargeable battery, so yes, youπll reduce the life of the battery. Have a friend who routinely shut off her power strip after shutting off her iMac. Battery died in about 18 months. She doesnπt do it any more.

Previously, Georg Schwarz wrote:

I have been told that completely cutting off the power (via a mechanical switch) to an iMac G5 during non-usage times could reduce the liftime of the build-in lithium battery. Is that true? Can I find a statement from Apple on that issue or any advice pro or against completely cutting off power?

Message #3 - Posted 2005/09/25 - Anders Eklöf

Georg Schwarz wrote:

I have been told that completely cutting off the power (via a mechanical switch) to an iMac G5 during non-usage times could reduce the liftime of the build-in lithium battery. Is that true? Can I find a statement from Apple on that issue or any advice pro or against completely cutting off power?

You don't need a statement from Apple to understand that. It's not exactly rocket science.

I recommend Macs to my friends, and Windows machines
to those whom I don't mind billing by the hour

Message #4 - Posted 2005/09/25 - Gregory Weston

Previously, P M Evans wrote:

As I understand it, with the computer shut down but still connected to a live power source you have a trickle of energy going in to maintain the PRAM settings. When you kill that power source, the PRAM battery kicks in to maintain the settings. The longer itπs shut down, the more the battery drains, and itπs not a rechargeable battery, so yes, youπll reduce the life of the battery. Have a friend who routinely shut off her power strip after shutting off her iMac. Battery died in about 18 months. She doesnπt do it any more.

I'll "me-too" that. My mother used to run through a battery every year until I convinced her she didn't have to switch off the power strip. And they were $15 batteries for her model.

G

Goal 2005: Convincing James Hetfield to cover the Strawberry Shortcake "Are You Berry Berry Happy?" song.

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