ACPI battery number is given as argument, at 'funtions' battery, battery_bar and battery_percent. By default the argument is BAT0. But if it doen't work, let's find out the correct argument:
- Open the terminal and type:
$ ls /proc/acpi/battery
- There can be various kind of output:
My output was: CMB0
- Open the .conkyrc file and edit to (examples):
Obviously, replace CMB0 with the output you received earlier.