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I had a laptop battery that was 14.4 V, and I ordered an aftermarket replacement. The replacement was sold as 14.4 V but says on the battery that it is 14.8 V.

Is this safe to use?

The original AC adapter is rated 24.5 V.

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it depends on how your laptop producer defined input voltage acceptance margin. If you have doubt about it, it would be good idea to contact with support team of the laptop producer –  angs Jul 15 '13 at 21:01
    
It is an ibook g4, 14 inch –  Jimmy Diggs Jul 15 '13 at 21:03
    
Google says it uses M9338G/A batteries and the voltage varies between 14.8 and 14.4 from supplier to supplier. I think it should be safe to use, otherwise it could not be sold as M9338G/A battery. But if you want to make 100% sure about it, then contact with Apple about it. –  angs Jul 15 '13 at 21:09
    
Okay. thanks angs! –  Jimmy Diggs Jul 15 '13 at 21:23
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