Cannot charge battery

If the red light is flashing after inserting a NP-20 battery in the Casio Lithium Charger BC11-L, it means that the battery will not take a charge. Normally when putting the batterry in the charger, the light will be a constant red. After charging is complete, the red light will go out. Battery is then fully charged and ready for use.

I found this while trying to solve my exact same problem.. It worked for me after about 7 times. Some other people on the site said it worked for them after 20 times. Good luck!

My NP 20 gave me the flashing red light of death and I got Casio to replace it. Then I had the same problem with my second NP 20 so I dug around for a way to fix it and I found the following advice on a site called FixYa. It worked instantly and I didn't risk ruining my battery.
ylu1 writes:
I had the same problem as this.
what i did was...
i kept putting the battery on the charger then took it off as soon as the red light came on.
i did this about 6 times.
doing this puts a bit of charge in the battery each time before the charger starts to flash.
after the battery as got enough charge in it it can start to charge.
hope this helps.

I found this while trying to solve my very similar problem. It worked for me after about 7 times. Other people wrote that it wook them 20 times... good luck!

My NP 20 gave me the flashing red light of death and I got Casio to replace it. Then I had the same problem with my second NP 20 so I dug around for a way to fix it and I found the following advice on a site called FixYa. It worked instantly and I didn't risk ruining my battery.
ylu1 writes:
I had the same problem as this.
what i did was...
i kept putting the battery on the charger then took it off as soon as the red light came on.
i did this about 6 times.
doing this puts a bit of charge in the battery each time before the charger starts to flash.
after the battery as got enough charge in it it can start to charge.
hope this helps.

I had this exact same problem. Here's a solution. I had to do it about 7 times and others on Amazon said they had to do it about 20 times. But it does work! My light is a solid red as we speak! Good luck!

My NP 20 gave me the flashing red light of death and I got Casio to replace it. Then I had the same problem with my second NP 20 so I dug around for a way to fix it and I found the following advice on a site called FixYa. It worked instantly and I didn't risk ruining my battery.
ylu1 writes:
I had the same problem as this.
what i did was...
i kept putting the battery on the charger then took it off as soon as the red light came on.
i did this about 6 times.
doing this puts a bit of charge in the battery each time before the charger starts to flash.
after the battery as got enough charge in it it can start to charge.
hope this helps.

I called casio and they told me that when you have a red flashing light on the charger it means the lithium battery is no longer any good. They offered to send me one free of charge. It's been several weeks and I have yet to receive it.

I had the same problem. Here's what I found that worked for me. I had to do this about 7 times but others that I read had to do it about 20 times but worked for them as well. Good luck!

My NP 20 gave me the flashing red light of death and I got Casio to replace it. Then I had the same problem with my second NP 20 so I dug around for a way to fix it and I found the following advice on a site called FixYa. It worked instantly and I didn't risk ruining my battery.
ylu1 writes:
I had the same problem as this.
what i did was...
i kept putting the battery on the charger then took it off as soon as the red light came on.
i did this about 6 times.
doing this puts a bit of charge in the battery each time before the charger starts to flash.
after the battery as got enough charge in it it can start to charge.
hope this helps.

Here's what I found and it actually worked after about 7 times. Others said they had to do it about 20 times. Good luck!

My NP 20 gave me the flashing red light of death and I got Casio to replace it. Then I had the same problem with my second NP 20 so I dug around for a way to fix it and I found the following advice on a site called FixYa. It worked instantly and I didn't risk ruining my battery.
ylu1 writes:
I had the same problem as this.
what i did was...
i kept putting the battery on the charger then took it off as soon as the red light came on.
i did this about 6 times.
doing this puts a bit of charge in the battery each time before the charger starts to flash.
after the battery as got enough charge in it it can start to charge.
hope this helps.

I read that if you connect a 9V battery (+ to +, - to -) to the NP-20 for 10 seconds, it will jump start the battery and provide just enough charge for the battery charger to recognize the battery. The problem is that the NP-20 battery becomes so low that the charger will not charge it. I also read that you can use 2 D size batteries if you don't have a 9V battery.

Just make this connection to the NP-20 battery, not while in the charger! Only connect it for about 10 seconds or so. Everyone who tried it was successful and the battery would charge when it was put back into the charger. There should be no need to buy a replacement battery.

I found this while searching to find an answer to solve my problem. It worked! Some say that it took them about 20 times... it took me about 7. Be patient and just keep trying! Hope this helps!



My NP 20 gave me the flashing red light of death and I got Casio to replace it. Then I had the same problem with my second NP 20 so I dug around for a way to fix it and I found the following advice on a site called FixYa. It worked instantly and I didn't risk ruining my battery.
ylu1 writes:
I had the same problem as this.
what i did was...
i kept putting the battery on the charger then took it off as soon as the red light came on.
i did this about 6 times.
doing this puts a bit of charge in the battery each time before the charger starts to flash.
after the battery as got enough charge in it it can start to charge.
hope this helps.

Its pretty simple to fix. The lithium battery has just depolarized. Just buy a 9V battery.... put them end to end... the 9V and the lithium and touch the metal parts of them. hold for 20 seconds... if it doesn't work, lick the 9V to conduct the electricity better.. hold for 20 seconds and put directly on the charger... I just did this, and it is charging as we speak! good luck!