Battery Check
Usually when checking the battery some signs of it being a dud is:
a) Bulges on the sides where car is trying to charge it but some of the plates inside have sulphated which can create heat which will distort the battery sides.
b) Checking the water level is correct.
c) Signs of sulphation (Crystalization) on the exterior of the battery.
:glance: Have you fully charged the battery with a charger, best charger I've used is a RSC8 which you can purchased from most motor stores like Halfords, MotorWorld e.t.c.
fwn A normal Voltmeter can only tell how many volts are in the battery, 13.2v is nominal voltage max these days is 14v. But usually you can have 13 volts but no Cold Cranking Amps to get your engine turning over.