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If it is a Makita battery charger it means the battery has died or has an internal fault, or is too hot.
Take it out of the charger, let the battery cool down if required and try again.
If both red and green lights are flashing, try a different battery.
It might be time for a replacement battery.
A red light indicates the charger is charging the battery, an amber light means it has switched from fast rate charging to trickle to keep the battery topped off, and green would mean the battery is completely charged. But don't be fooled waiting for green, many times the charger will only be on green for a moment before changing to amber and keeping the battery topped off.
Flashing can be a sign of a problem on some chargers.
A rapid flashing red can on some chargers indicate a bad or shorted battery, or a bad battery contact in the charger itself. If in question, try a different battery on the charger or compare with another charger to determine if the blinking is normal.
If both lights are on and both are flashing the charger is reading the battery as defective and the charger won't charge the battery. If the Red light (yellow if plastic is faded) is on and the green is flashing the charger is trying to charge the battery. If the battery won't charge replace it.
It's a known Fault with the NP-20 battery don't order one and pay for it, ring or e-mail casio customer service they should send you one out for free!! When you receive the new one don't let it die, make sure and keep it partially charged at all time or the charger won't recognize it. Really casio should recall this battery but for some reason they insist on replacing faulty batteries with more faulty batteries!??!
sounds like a dead battery. Plug the origional charger into it and the front led (below the flash) should flash red. If the red led in the back of the camera flashes or stays lit, then you have the wrong charger plugged in. (the camera won't power up if the back red/green led is on when plugged in)
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.