Low battery warning

when I use it on battery (I mostly use AC power), it did not warn me at the 20% level.

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Daniel Cohen wrote on 28 August 2006:

Looking at the System Profiler recently for my PowerBook G4 (OS 10.4.7), I found it stated, in the Battery Information section,

First Low Level Warning: No

My recollection is that, when I use it on battery (I mostly use AC power), it did not warn me at the 20% level.

So I'm wondering what is happening, whether I turned off a warning, and forgot about it. If so, how do I turn it on again?