>i attached my sensors-detect output and my i2cdetect 0 output. They clearly show that the battery isn't exposed on the SMBus. This confirms what Rurold Marek suggested, i.e. Acer didn't expose the battery to any standard interface, neither ACPI nor SMBus. So don't bother porting the smartbatt.c driver to Linux 2.6, it won't help. We obviously cannot help more, your last hope is to get in touch with Acer or someone who is familiar with their proprietary interface. Good luck, -- Jean Delvare