I have this "Laptop battery (estimating..)" on battery left click.
Doesn't change - 
Compaq Presario A900 (bios f.33)

whilst on battery
cat /sys/class/power_supply/BAT0/current_now 
0
cat /proc/acpi/battery/BAT0/state 
present:                 yes
capacity state:          ok
charging state:          discharging
present rate:            0 mW
remaining capacity:      3422 mWh
present voltage:         10800 mV

So same situation where no current rate is given.
But graphic bat OK and % reading in  power stats details tab.
I haven't tried ppa:brian-rogers/power yet but thanks to Andy Eyre and Brian 
Rogers for the option.
As it is a client machine and non crucial bug I am reluctant to modify from 
vanilla much.

-- 
Battery life estimation never comes around
https://bugs.launchpad.net/bugs/629258
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Desktop Bugs, which is a subscriber of a duplicate bug (38795).

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