I have a similar problem which may (or may not) be related to this one: The battery status does not get updated after a suspend to RAM, i.e. shows wrong values (see example below when the bat. charge changes from 10% to 98%). As a workaround, a restart of the upowerd solves the problem.

My configuration is an openSUSE 11.4 (KDE4.6) 64bit system on a Lenovo T510 notebook running a 2.6.35.11 kernel.

~ >solid-hardware details '/org/freedesktop/UPower/devices/battery_BAT0'
udi = '/org/freedesktop/UPower/devices/battery_BAT0'
parent = '/org/freedesktop/UPower' (string)
vendor = 'LGC 11' (string)
product = '42T4853' (string)
description = 'Lithium Ion Battery' (string)
Battery.plugged = true (bool)
Battery.type = 'PrimaryBattery' (0x3) (enum)
Battery.chargePercent = 10 (0xa) (int)
Battery.rechargeable = true (bool)
Battery.chargeState = 'Discharging' (0x2) (enum)

~ >sudo killall upowerd
~ >solid-hardware details '/org/freedesktop/UPower/devices/battery_BAT0'
udi = '/org/freedesktop/UPower/devices/battery_BAT0'
parent = '/org/freedesktop/UPower' (string)
vendor = 'LGC 11' (string)
product = '42T4853' (string)
description = 'Lithium Ion Battery' (string)
Battery.plugged = true (bool)
Battery.type = 'PrimaryBattery' (0x3) (enum)
Battery.chargePercent = 98 (0x62) (int)
Battery.rechargeable = true (bool)
Battery.chargeState = 'Discharging' (0x2) (enum)

It is probable this is a bug in UPower not handling suspend properly, please file a bug with the UPower developers. Not much KDE can do unfortunately...