все таки в HP 311 странная батарея, вот в таком состоянии ноут еще минут 10 проработал:

ice@HP:~$ cat /proc/acpi/battery/BAT0/*
alarm:                   unsupported
present:                 yes
design capacity:         5100 mAh
last full capacity:      5080 mAh
battery technology:      rechargeable
design voltage:          10800 mV
design capacity warning: 2 mAh
design capacity low:     2 mAh
capacity granularity 1:  10 mAh
capacity granularity 2:  25 mAh
model number:            Primary
serial number:
battery type:            LION
OEM info:                Hewlett-Packard
present:                 yes
capacity state:          critical
charging state:          discharging
present rate:            unknown
remaining capacity:      0 mAh
present voltage:         9032 mV?