My replacment battery only lasted 10 mins then blue lights and Rovio turned off. This has been a problem for many here, and some have replaced it with 9v chargers.
I may have made an important discovery to fix this problem, if you charger is going of course.
What I found is after 1/2 an hour, or so, the pulsing would stop and Rovio showed full charge. What I have done is place it back on the dock, would charge a bit more, when it says full do it again and again.
Now I have had 43 mins on the battery, seems you can get a false indication your battery is charged. This can often happen with rechargables, which is why they say it can take serveral charges before you get max battery charge.
I know I find this is working with my Rovio. I am hoping it will give me a longer battery life then my other battery, which will last about 45 mins without the headlight accessory.
If your having your battery last only 10 mins keep charging your battery, when it indicates full charge, undock, then redock. I am seeing how long the replacement battery lasts in my broken Rovio