Sorry,I just want to be brief to describe my situation but forget to add some important details.
I'm using Slackware Linux,
Kernel-2.6.14.3 with ACPI,upgrade from Slackware testing kernel.Also,the computer is my notebook (Dell Inspiron 300M) with ACPI.
Chinaman,thanks for your help.But I don't get anything from your command.Because in the folder /proc/acpi/,I can't find battery folder.
I just don't want to "recompile" my kernel because I have got through this and it takes time.
Thanks for the help you guys have given.