Every rechargeable battery has a certain cycles of charging and discharging the battery. Not two batteries have the same life time. The amount of cycles a battery can have, can be influenced by the user. If you leave a battery without charging or discharging for months or even years, the lifetime can be shortened. That is why most of the time you get warranty on the equipment, but almost never on a battery. (sometimes a warranty of 90 days is given on a battery.)
Still when a battery won't charge, you could check all the parts in the chain. The AC / DC power convertor / charger the power cable.
When the light on the charger comes on, you can assume the charger is working.
If you can charge the battery in the camera everything looks the same. As soon as the green light comes on (starts to flash slow) you can assume the AC adopter is working. The charging of a fully discharged battery should take about 4 hours.
I have two Kodak Li/ion batteries and after almost 10 years, they are still on good condition. But I also had to trow away lots of other batteries, before they were about one year of age. (I did charge them wrong, with a high current, more then they could handle)
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