How do you know when the battery is kaput?

Pip1968 · 04-05-2013, 01:23 PM

As per title. I did change the OEM battery for a similar power and size unit namely a Bosch S4 075 - 60Ah/540 cca (and only £50.88 from Eurocarparts) but when I looked at the little 'window' on the BMW battery it still seemed to be green. It had been on trickle charge.

Now I know it was probably due to be changed due to age anyway but how can you tell that the battery is kaput aside from dim lights (not experienced), unable to crank the car (it was flat after being in with BMW for a while) and the battery warning light (not seen). Can I measure the voltage across the terminals or is this only when on the car - ???

I am just wondering if it is my alternator failing and not the battery.

Pip

04-05-2013, 01:23 PM	#1
Pip1968 S5, Sport Off, DSC M-track Join Date: Dec 2007 Location: Kent, England Posts: 940 Casino cash: $8383	How do you know when the battery is kaput? As per title. I did change the OEM battery for a similar power and size unit namely a Bosch S4 075 - 60Ah/540 cca (and only £50.88 from Eurocarparts) but when I looked at the little 'window' on the BMW battery it still seemed to be green. It had been on trickle charge. Now I know it was probably due to be changed due to age anyway but how can you tell that the battery is kaput aside from dim lights (not experienced), unable to crank the car (it was flat after being in with BMW for a while) and the battery warning light (not seen). Can I measure the voltage across the terminals or is this only when on the car - ??? I am just wondering if it is my alternator failing and not the battery. Pip