Trying to charge up my battery for EXILIM EX-Z75 camera. The red light on the charger keeps flashing and the battery doesn't charge. Have checked battery is correctly inserted - which it is. Do I need a new battery? Or a new charger?

It is important that the charger is checked for output voltage before you purchase a new battery.

This often means that the battery is bad. It's a good idea to only charge the battery as long as is necessary, and to then remove the battery shortly after it is finished charging. This helps prevent from an over-charge on the battery which can damage the battery life.

Chances are that your battery is worn out beyond recharging. Time to replace it.

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.

Try replacing the battery, it seems a battery issue

Yes you need a new battery. I had the same problem almost exactly a year ago. You need to contact Casio and tell them the problem, they should send you a new battery free of charge. This is the proper number to call, 1 800 435 7732. Just tell them your battery charger is flashing red when you are trying to charge and they will send you a new battery.

buy a new battery (DUH)

The chances are pretty good that the battery is bad. Buy a new battery - they are inexpensive.

This occurs osmetimes when the connections are not completely clean. Wipe them off and then slowly and firmly insert it inthe charger.

possibly with the usb cable but most likely you have to get the charger. http://www.amazon.com/Casio-Exilim-EX-Z75-Replacement-Battery/dp/B00125VCF4