Automotive Battery Voltage -What is ur reading?
- Thread starter Patrick0525
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Low temperatures give lower reading.Miscalibrated voltmeters also.
You should check the voltage after a good ride or after a good charge with a proper device to see how much voltage there is initially in order to see if it is not holding the charge/you have battery drain or you simply have low voltages all along.
You should check the voltage after a good ride or after a good charge with a proper device to see how much voltage there is initially in order to see if it is not holding the charge/you have battery drain or you simply have low voltages all along.
When driving it gets to 14.4 when car is turned off its at 13.2 probably the surface charge. If its a quick visit to the shops then when i get back its at around 12.6 but overnight it drops.
This was the same battery that was being undercharged for many months by the old busted alternator. So i think its taken its toll on the battery
This was the same battery that was being undercharged for many months by the old busted alternator. So i think its taken its toll on the battery
Originally Posted by slybunda
When driving it gets to 14.4 when car is turned off its at 13.2 probably the surface charge. If its a quick visit to the shops then when i get back its at around 12.6 but overnight it drops.
This was the same battery that was being undercharged for many months by the old busted alternator. So i think its taken its toll on the battery
Sounds like the battery in my 530i. It's at 12.1V after you remove surface charge, when the car is sitting in an unheated attached garage (around 33F temperature). If I leave it outside in colder weather, it'll show 11.9V. Yet the car still starts fine and my CenTech battery analyzer thinks the battery is in good shape.
When driving it gets to 14.4 when car is turned off its at 13.2 probably the surface charge. If its a quick visit to the shops then when i get back its at around 12.6 but overnight it drops.
This was the same battery that was being undercharged for many months by the old busted alternator. So i think its taken its toll on the battery
Sounds like the battery in my 530i. It's at 12.1V after you remove surface charge, when the car is sitting in an unheated attached garage (around 33F temperature). If I leave it outside in colder weather, it'll show 11.9V. Yet the car still starts fine and my CenTech battery analyzer thinks the battery is in good shape.
Yea my battery analyzer says its good and has low internal resistance still. But i know its a dodgey battery so what causes its voltage to remain low and still pass the conductance tester?
Also since it passes the tester iv not taken it for warranty claim yet incase they also use a tester like mine and it passes on that too.
Very odd
Also since it passes the tester iv not taken it for warranty claim yet incase they also use a tester like mine and it passes on that too.
Very odd
Originally Posted by slybunda
Yea my battery analyzer says its good and has low internal resistance still. But i know its a dodgey battery so what causes its voltage to remain low and still pass the conductance tester?
Also since it passes the tester iv not taken it for warranty claim yet incase they also use a tester like mine and it passes on that too.
Very odd
If it's working, does it really matter that the seems a bit off? I thought current starts a car and not necessarily voltage.
Yea my battery analyzer says its good and has low internal resistance still. But i know its a dodgey battery so what causes its voltage to remain low and still pass the conductance tester?
Also since it passes the tester iv not taken it for warranty claim yet incase they also use a tester like mine and it passes on that too.
Very odd
If it's working, does it really matter that the seems a bit off? I thought current starts a car and not necessarily voltage.
At least with Lithium rechargeable battery technology, early attempts to charge and monitor the battery through just voltage and current characteristics kind of fell apart. Didn't they tend to catch on fire from overcharging and sometimes died from deep discharge? Just current/voltage characteristics weren't enough because a mistake could cause severe overheating.
The consequences for a car battery may not be as severe, but they could still work better with better technology. I know there are some car batteries (I'm thinking BMW) that have onboard battery monitoring that's similar to how lithium rechargeable are monitored. But then it gets tricky because then it makes aftermarket replacement more difficult.
The consequences for a car battery may not be as severe, but they could still work better with better technology. I know there are some car batteries (I'm thinking BMW) that have onboard battery monitoring that's similar to how lithium rechargeable are monitored. But then it gets tricky because then it makes aftermarket replacement more difficult.
Slybunda
I have seen the same voltages on my 2005 fiesta when it was cold outside (0 Celsius) even after a 5 hour trip. After sitting overnight voltage dropped at 12.0 volts.4 years later, the same battery still works fine,I just plug a weak (3W) solar maintainer which provides just a shot of some amperes when it is not cloudy or raining (sometimes it may rain for days even in Greece) and charge it with my ctek mxs5.0 every now and then (once every 2 months if I do not make extended trips) , so I take some care of it.
Lead acid batteries are strange sometimes.
I have seen the same voltages on my 2005 fiesta when it was cold outside (0 Celsius) even after a 5 hour trip. After sitting overnight voltage dropped at 12.0 volts.4 years later, the same battery still works fine,I just plug a weak (3W) solar maintainer which provides just a shot of some amperes when it is not cloudy or raining (sometimes it may rain for days even in Greece) and charge it with my ctek mxs5.0 every now and then (once every 2 months if I do not make extended trips) , so I take some care of it.
Lead acid batteries are strange sometimes.
14.5 as read by Banks
Originally Posted by Kibitoshin
Diehard Platinum (Odyssey 34/78) dated Dec 2013 after sitting overnight voltage @ 12.3v. CCA test w/ Solar BA7 tester @ 665 CCA. Not bad for 5 years since most flooded batteries in Hawaii lasts 3 years.
Update after standing for a week: 12.2v @ 630CCA 77F.
Diehard Platinum (Odyssey 34/78) dated Dec 2013 after sitting overnight voltage @ 12.3v. CCA test w/ Solar BA7 tester @ 665 CCA. Not bad for 5 years since most flooded batteries in Hawaii lasts 3 years.
Update after standing for a week: 12.2v @ 630CCA 77F.
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