For the members using Sony VAIO Laptops, i have a solution for you
This
comes straight from the VAIO Support Website;
This issue will occur if the Battery Care Function utility, which is
disabled by default, has been enabled. This utility is accessed through VAIO
Central and limits the amount the battery will be charged. Follow this
procedure to disable or reconfigure the Battery Care Function utility
settings.
Click the Start button, click All Programs, and then click VAIO Central.
NOTE: If prompted for an administrator password or a User Account Control
prompt is displayed, type the appropriate password or click Continue.
In the VAIO Central window, click the List tab.
On the List tab, double click Battery Care Function.
In the Battery Care Function window, to disable the Battery Care Function
utility, click to clear the check mark from the box next to Enable Battery
Care Function.
To leave the Battery Care Function utility enabled but change the
configuration settings, in the Battery Care Function Settings section, click
to select the desired setting.
NOTES:
There are three different options in the Battery Care Function Settings
section:
Battery Care Function - The battery charge level will be about 80% of a
fully charged battery, however, this mode prevents battery degradation and is
more effective if you usually use the computer with battery power.
Super Battery Care Function - The battery charge level will be about 50% of
a fully charged battery, however, this mode prevents battery degradation and
is more effective if you usually use the computer with the AC adapter.
The settings for Battery Care Function on each battery... - This selection
gives you the ability to customize the battery settings. If this option is
selected, the battery charge level can be set to either 100%, 80% or 50% by
clicking the down arrow and selecting the desired charge level.
When the Battery Care Function utility is enabled and configured to any
setting other than 100%, depending on the selection made, the battery will
only charge up to the 80% or 50% charge level.
Once all desired configuration changes have been made, click the OK button.
In the VAIO Central window, click the X in the upper right corner to close
the window.
Restart the computer.