Problems with the battery's leds


Hi all,
I am new to the apple world, I chose to enter it by purchasing a second hand revision A powerbook g4 17".
I have issues with my battery. while there are no problems related to the battery life (3:30 approx), the problem is with the battery's charge indicator leds which are allways on (actually 4 out of 5), even if the battery discharges, they remain on (before I upgraded to tiger, I would push the button, and the leds would light for 1 second or 2 and then go off, but it is not the case now)
Did anyone experience the same thing? is my battery having issues (though, no noticeable problems concerning battery life, as stated earlier)
Thanks in advance.