ACER SK-9662 KEYBOARD DRAINS BATTERY LIKE CRAZY

Help!

I have got a Acer wireless keyboard SK-9662 when i bought my Asprire desktop. However, this keyboard drains the battery really quickly (averaging once every 2 weeks), while the acer mouse last a long time. Both mouse and keyboard comes together and are about 1+yrs old.

Is this due to the lack of driver for the keyboard? My keyboard and mouse are both placed similarly near the USB dongle.

please help