I had the same problem after the first charge, ie weeks after purchase.
I was able to charge my battery in a friends charger no problem. So sent the charger back and got a replacement. Unplugging didnt work for me
Okay what happens sometimes is the charger gets into a feed back loop. What to do is remove the battery unplug the charger wait a few seconds (Maybe 20/30) plug the charger back into the outlet and then put the battery back in the charger. It should start to charge again and a few minutes later go to the blinking for full charge green.
It'll happen the other way as well meaning if the battery gets a memory (they say they don't but they do) you need to unplug the battery let is sit till it's cool and put it back on charge again. I've had this problem many times and have put it on charge and back off several times with in 15 minutes before it started to charge as it should.
Also these batteries do have a life span and if it's a three year old battery with many charges it could be failing meaning it just won't take a full charge.
How long that takes to full charge canon 550d battery ?
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