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How to check if my battery is healthy?

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?