Is my battery knackered?

_Dragon_

Been having problems with my ABS light not going out on the dash when it does its self check, Could be the sensor, the resting charge of the battery is 12.5v but when i turn the ignition on it goes down to 12.2v i know ABS can act up if you have a battery on its way out.

EDIT: I have never tested what the volts are when the ignition is on so i dont know if its normal for it to drop that much. Also sometimes if i put my foot on the brake and then start it the ABS does its self test and goes out as it should. The ABS light never comes on while i am driving, So its got to be the Sensor or Battery.

IronGiant

What is the cranking voltage?

_Dragon_

Not checked that yet, will have to get someone to help me with the reading while i start the car.

Aerojon

normally with a modern car a failing battery will throw all warnings not just abs..get the code/s read thru the obd port..the code will tell you the issue..

_Dragon_

I cant say i have any other lights come up on the dash, I shall pop in to my local garage to see if any codes have come up.