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The battery is no longer good. You will need to buy a new battery. Don't over charge your batteries. They all vary. Expensive cordless tools will come with a charger that shuts off automatic to prevent over charging. I own cheap Skill drills that has served me well. These batteries lasted over 11years. It makes no sense. They should not have lasted more than 5 yrs., even 2yrs. I make sure I never over charged them, but they should not last that long. Freaky. Your battery is dead forever, sorry. I have others just like yours waiting to be recycled.
Batteries don't always look degraded but if they've been in use for a while or have a bad cell, they will show up bad on the charger and it won't charge them. The only way to test the batteries is to try to charge them on another charger. If the batteries show defective on another charger, they are bad and you'll have to replace them. Also try to charge some batteries you know to be good on your charger to see if it's the problem. If your batteries charge on another charger, your current charger is bad and they don't have any replaceable parts in them so you'd be looking at replacing it.
Sometimes, batteries tend to show charge but they are not completely charge. Reason is that they have got weakened and needs to be recharged properly.
For this, I would recommend you to use Nicad Battery Repair Manual. It would charge the crystals inside the battery completely and make them work like the new ones. Hope it would be useful for you. Take care.
I think the charging port is bad and this could be as a result of factory error since the fault is not from you. The phone restarts probably because the charging ports is bridging.
I will advice that you purchase a desktop charger that will enable you charge the battery seperately and when the battery gets full, you insert it into the phone. You could get another battery so that while you charge one, you use the other.
Or if you can look for a repairer, that will help you fix the fault of your phone.
all chargers show a light of some colour when charging , green or red , depending on make of charger , when the battery is fully charged the unit monitor this and automatically switch of to stop from over charging , a safety feature that has to built in for safety reasons ,
For others with the same problem (flashing red light won't go off)...make sure you FIRMLY PUSH the battery down onto the charger and engage the latches. Simply resting the battery on the charger will not work.
with Nimh batteries you can charge them anytime, you dont have to run them down first like nicads. just put the batteries in the charger with the flat end (-) against the spring and plug it in. some models have a red light to show its chargeing and a green one to show its fully charged while others just have a light to show it is chargeing.