If the charger of your Parrot Bebop drone keeps blinking red after you plugged your battery in, it is because it’s refusing to charge it due to a low voltage. Sort of a safety feature but it is pretty annoying.
To solve this issue, Martin suggests to plug your battery in the charger, wait for it to blink, remove it, put it again as long as you need it for the red LED not to blink anymore.
What this operation does is that it actually feeds a bit of energy to the battery everytime you plug it *before* the charger checks the voltage..
If you can’t get it to work or find it anoying there are some 3rd party batteries on Amazon and some even have more capacity than the original.