The best use of a new battery

Already I have bought the new battery. Now I would ask about the best way to use it. As a matter of fact 90% of the time I use the iBook at home. What is it better, to use the old battery that still has an hour of duration and to bring the new one for when it will be required or to install the new one and to forget about the old one? The two years of life of the battery are they from the date of manufacture or from the first use?
Thank you for your attention,
Joan

Hi Joan,
Lithium ion batteries start declining the day they're manufactured. The average life is 2-3 years. You can extend the life by storing a partially charged (~40%) in the refrigerator. If you current battery has only 1 hour of run time it's near the end of its usefull life. Calibrating your computer's battery will also help you get the maximum life from it.
John

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