My Lenovo ThinkPad T61
is rather old, and a couple of years ago I had to replace the battery as the old one was dead. Now the replacement battery seems like dying a slow death, but I get conflicting data from xfce4-power-manager
. So I'm wondering if there is a way to check whether the battery is healthy.
The symptoms are as follows:
- The power manager indicates that the
battery is fully charged
- If I disconnect the AC charger, then the battery status jumps to
47%
or similar in less than 5min - And in less than 15min the laptop runs out of juice and shuts down
I tried to check upower
data:
root@malou-laptop:/home/liv# upower --enumerate
/org/freedesktop/UPower/devices/line_power_AC
/org/freedesktop/UPower/devices/battery_BAT0
root@malou-laptop:/home/liv# upower -i /org/freedesktop/UPower/devices/battery_BAT0
native-path: /sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/device:00/PNP0C09:00/PNP0C0A:00/power_supply/BAT0
vendor: SANYO
model: 92P1137
serial: 885
power supply: yes
updated: Wed 19 Feb 2014 09:35:37 PM CET (23 seconds ago)
has history: yes
has statistics: yes
battery
present: yes
rechargeable: yes
state: fully-charged
energy: 70.38 Wh
energy-empty: 0 Wh
energy-full: 72.42 Wh
energy-full-design: 71.28 Wh
energy-rate: 26.561 W
voltage: 12.4 V
percentage: 97.1831%
capacity: 100%
technology: lithium-ion
I also looked at ACPI
data:
root@malou-laptop:/home/liv# cat /proc/acpi/battery/BAT0/info
present: yes
design capacity: 71280 mWh
last full capacity: 72420 mWh
battery technology: rechargeable
design voltage: 10800 mV
design capacity warning: 3621 mWh
design capacity low: 200 mWh
cycle count: 0
capacity granularity 1: 1 mWh
capacity granularity 2: 1 mWh
model number: 92P1137
serial number: 885
battery type: LION
OEM info: SANYO
root@malou-laptop:/home/liv# cat /proc/acpi/battery/BAT0/state
present: yes
capacity state: ok
charging state: charged
present rate: 0 mW
remaining capacity: 70380 mWh
present voltage: 12400 mV
But I cannot pinpoint anything suspicious: the design capacity
and last full capacity
seem healthy to me.
So is there some other utility that could indicate whether the battery is working as expected, or needs replaced?
Best Answer
I don't know why you're looking for corroborating evidence from the system, when you have solid empirical evidence. The battery won't hold a charge. Period, end of story.
I'd be happier if I saw a high charge cycle count. Lithium ion isn't good for more than about 500 charge cycles.
Another datum, which won't appear in the places you've been looking, is how much of the laptop's usage life on this new battery has been while plugged in, and whether it's frequently gone through a full discharge/charge cycle.
Too many people use laptops as if they were small desktops, leaving them plugged in most of the time. This is not healthy for the battery. The analogy I like to use is that a toy balloon will last longer if you blow it up only part way, rather than blow it up as far as it can go and leave it there. A full charge on the battery increases some of the stresses on it.