`when connected charge light never changes from yellow to green to indicate fully cgarged ,sometimes it is and other time not

SOURCE: Dell latitude D600 battery charge light flashing

That usually indicates battery is beginning to go bad. Eventually it will not hold a charge and will need to be replaced.




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SOURCE: nokia 6500 classic charging problems

I have had exactly the same problem, and have replaced both the charger and the battery.

I think the problem lies in the contacts between the charger and the bayonet and the battery..
Soooo
I put a couple of peices of folded paper behind the battery, making a very very snug fit.

then, (this is a bit fiddly)
i carefully folded a slim peice of paper to wedge behind the charger pin and the back of the bayonet, so the pin is pushing against the front of the bayonet.
( to do this, position the paper over the pin and push into the socket at the same time.)

works like a treat :)
if you had exactly the same problem, it will be due to the charger wobbling around about the socket.


this ensures a tight fit and means it maintains contact all the time.

good luck, and i hope you haven't started to tear your hair out quite yet.

SOURCE: I cannot charge my Samsung L210 digital camera

it has a technical problem you should go to a person who repairs

SOURCE: both green and yellow light stay on and batteries

If both yellow and green LEDs come on, this indicates
a deeply discharged or defective battery pack.
Allow the battery pack to remain in the charger for 15
to 30 minutes. When the battery pack reaches normal
voltage range, the red LED should come on. If the
red LED does not come on after 30 minutes, this may
indicate a defective battery pack and should be
replaced.
n After normal usage, a minimum of 1 hour of charging time
is required to fully recharge battery pack.

SOURCE: why my 28v doesn't fully charge

One or more cells of the battery have gone bad. The technique of measuring the state of charge of the battery is VERY limited.

I would recommend letting the battery cool after charging... THEN in a day, charge it again without using it. Do this for several days and see if the battery improves. If not, time for new battery.

DO NOT discharge these batteries beyond the point where the tool starts to slow down. You will reverse charge the weakest cell from the ones still deliveing power and the reverse charge will permanently damage the weakest cell.