I've done some testing against the mainline kernel 2.6.37-999-generic
#201101121009 SMP Wed Jan 12 10:10:37 UTC 2011 x86_64 (logs attached)
and the problem seems to be partially fixed. The power statistics graph
for both charging and discharging processes seems to be ok with the
newest kernel so I don't get "low battery" warnings all the time (while
running kernel version 2.6.35 the battery status was marked as very low
right after disconnecting form AC adapter). What is still missing are
the battery charge and discharge time estimations. They both are marked
as 0 minutes which is weird because power-manager receives proper
percentage statistics... I think there might be a problem with proper
detection of battery specs. - it is reported as "non-rechargeable" in
/proc/acpi/battery/BAT_0/state

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https://bugs.launchpad.net/bugs/686078

Title:
  Battery charge time is not estimated properly.

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