When hooked up to charger red light blinks. Light will not come on without charger hooked to it.

You need a new charger.

The red light is the power light and if the red light is blinking the charger is bad or the wiring is bad on the chair or the batteries are bad. Usually it's the charger.

If the radio will charge on one charger and not the other, the one with the blinking light is bad or has a dirty or defective battery contact. Check your charger for debris and clean your battery contacts with a pencil eraser and try charging again. If this fails, replace your charger.

Best regards.

close it and charge it

I really don't have any idea as to what you're talking about here other than a battery and maybe a charger. Seems as if you're saying that you have a 12 volt 1.5 amp automatic battery charger connected to a 12 volt, 8.5amph battery but the red light on your charger is blinking. The blinking red light indicates that the charger is not seeing a proper connection such as crossed polarity connection or simply a poor connection. You say that the battery voltage has dropped from 12.5 volts to 9.1 volts with the charger connected. If this is the case, the battery is badly discharged and the charger is not charging the battery for some reason. The charger may be bad but check the connections to make certain they are correct and good. If they are, I'd replace the charger.

Good luck
Steve

Try a new or other charger, problem may be with the charger.

As you know, solid red on your charger means that the battery is fully charged and the BLINKING red light means the battery is charging. Unless the light is blinking irradically everything is working the way it is supposed to. If the light is blinking irradically, the battery may just be too hot or too cold to charge ( like when you are driving many lags and your battery dies) and in this case simply wait 15 minutes to charge. If you get a fast blinking light still, the problem probably is with the battery.

r u mention for battery light?if is it true,then the light is blinking because of your laptop want to make sure the power supply charge that battery.if it is in charging condition,the light on.but if the light goes off,that mean, the battery is already full.

But when u use adaptor without battery, the light will goes off because no charging session is in progress which has same behaviour with battery full(during battery full,no charging session occur)

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)