Car not start all time battery dies
Why is it my battery will be fine then it will have to be boosted or you power box to start it . Doesn't do it all the time
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Check that the battery terminal posts are clean and not corroded and that the cables connected to the battery posts are tight and secure.
Use a DMM's (digital multimeter) DC Voltage function to check if the battery is being charged correctly when the motor is running¹.
Park the car and with the transmission in Neutral (MT) or Park (AT) and the handbrake firmly applied, start the engine. Open the hood and connect the DMM across the +ve and -ve battery terminals.
The meter should show a voltage reading of 13.8V DC → 14.5V DC.
If it shows <13.8V DC then the battery is not being charged correctly. This could be due to a faulty voltage regulator or alternator.
If the voltage is OK it could be that the battery is failing. The best way to check this is to get the battery load tested at a battery replacement service centre.
How old is the battery? Getting 3-5 years out of a car battery before needing to replace it is about the average lifespan
¹ Be safety aware when measuring the battery voltage with the motor running! Make sure that no loose clothing (or hair) can get caught in the moving parts of the motor
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