A smart charger doesn't like a totally flat battery and usually it needs an old fashioned dumb charger for a short time to get some charge in. You must log in or register to reply here. Just picking the wrong register to read. 8V? Most batteries should read approx 13.8 volts when it is in standby mode and will show lower once you start loading it i.e. Dear guest, welcome to the Owners Club forums. It would just randomly not close on its own. That does not sound like a knackered battery to me. It’s a 12v battery after all, it’s just voltage settling after being at ~14v when driving. These numbers assume 100% healthy cells, and may vary a bit lower for older batteries. ‘Accidental Unplug’ Message - Am I Doing Something Wrong When Finished with a Charge. … This is about 13.8V at 25 deg C. It is higher at cold temperatures and lower at high temperatures. EV battery pack prices fell 13% in 2020, some are already below $100/kwh, What are the range estimates for the 4 configurations: 3P/4P battery, FWD/AWD, FIXED: Seems like abetterrouteplanner.com has wrong pricing for EA with SR battery. Back full of groceries and it wouldn't open. Measure While “At Rest” “Open Circuit” Note: For best accuracy when measuring battery voltage, the battery must be in ‘open circuit’ condition (at rest, or ‘resting’). JavaScript is disabled. The total capacity of a car battery is a product of the power you can draw multiplied by the number of hours before it fully reaches the depth of discharge (DOD). Breakdown Voltage Min and Max -> the voltage at which some specified and significant conduction occurs. Or sometimes it wouldn't open on its own. ~12.6V: fully charged ~12.4V: 75% charge ~12.2V: 50% An average car battery has a capacity of around 48 amp hours which means that, fully charged, it delivers 1 amp for 48 hours, 2 amps for 24 hours, 8 amps for 6 hours and so on. A car battery is considered fully charged at 12.6 volts or higher. The voltage reading of 12.4 volts will indicate that the battery is only 75 percent charged. Tap to unmute. As soon as its taken off charge the voltage will fall, over a 6-hour period, to 12.8v. Version 2 revised. Or … A basic charger usually charges at around 2 amps - and so needs 24 hours to deliver the 48 amps needed to fully charge a flat, 48 amp hour battery. Please only post "on topic replies". This is an important figure due to the fact that OEM alternators are typically ill-equipped to handle additional loads from aftermarket equipment and upgrades. With the car powered on all you are measuring is the DC/DC inverter output (approx 13-14V), which would be the same regardless of 12V battery condition. It's a 12v battery after all, it's just voltage settling after being at ~14v when driving. For a good charging system, the voltage should read between 13.8 and 14.5 volts. When the battery’s voltage drops, even a small amount, it makes a big difference in its performance. Or not. The actual resting voltage, or the voltage a battery will settle at 12-24 hours after being removed from the charger, is closer to 2.1 volts per cell, or about 6.4 volts for a 6v battery, and 12.7 volts for a 12v battery. But same experience. Hi John, you need to check the 12V battery with the car switched off, with a multimeter (several hours after being switched off). This means that the battery must NOT be under load and it must NOT be charging. VIN sticker/Sent to Plant 12/23/20 .....Build Week 1/4......Production Date 1/15/21. If the battery isn’t fully charged, it will diminish to 12.4V at 75%, 12V when it’s only operating at 25%, and down to 11.9V when it’s completely discharged. How many volts is a fully charged deep cycle battery? Typical battery voltage with the engine running is close to 14V, but can go as high as 15.5 V in cold weather. As mentioned above, there are many ways to interpret a car battery’s capacity, 50A per hour, or 25A for 2 hours, to name but a few. 120 Ah x 12v = 1200 divided by 30 watts is 48 hours ( less 50 %) = 24 Hours FWIW the voltage of a fully charged "12 volt" battery which is not supplying any current is about 13.2V, not 12V. Watch later. Its power drops from 100% to 25%. When the car is in Ready mode (i.e. Max Reverse Stand-off Voltage Vrwm -> the voltage below which no significant conduction occurs. On the flip side if you have a reading below 13.6 volts this means that your alternator is not putting out enough charge to effectively charge the battery. Share. Like others have said it is more important that the charging voltage is not too high. 24-hour Timer is set up in the program to terminate the charge and enter the maintaining mode once the voltage is above 14V to ensure safety. Well, it's happened a few more times now and I think maybe it is tied to the LVB. Location: Sumweer onat mote o'dust (Sagin). ... At the power supply I am reading 12v on the battery connector. If I had expensive equipment--I would think about disconnection of "car type" DC accessories at 14.5+ volts, and I would be really worried at 15.0+ volts. I'm a software guy and while I have no way to confirm it, it "feels" like somewhere a "DC OK" type check is reading the current battery level from the main battery instead of the 12V battery. Car Battery Load Tests If you need a reminder of the club rules then click on the FAQ tab. A good battery will then stay at 12.8v for a long time, losing maybe 0.05v a week. As there will always be some drain on a battery, it won't be at 14v for very long even if well charged. Is 12.4 volts OK car battery? tested my battery with a cheapo /generic voltage tester, it is showing 14 volts when doing nothing, is that normal? When a car drops, for instance, from 12.6 to 12.0, there will be 75% difference. A reading anywhere from 13.6-14.6 volts means your alternator is functioning properly. Something I'm trying to investigate and thought I'd share in case this lines up with anyone else experience. Show Less. As of now any off topic posts will be removed. Dead 12V Car Battery Recovery Recharge & Revive From 5V - YouTube. I've never measured under 12V, but I have measured 12.0V or very close the last 3 times it has happened. if it needs water use distilled and if the plates were exposed then sulphation has started. I rechecked the 12V battery and it was still in the same 13-14V range - no change there. (6 hours before the battery is completely discharged, or in the case of deep cycle batteries, where you should never discharge more than 50% of your battery, you would get 3 hours run time. a few times while opening and closing the trunk to test the fob and the trunk , it would not close by pushing the buttons on the trunk - just the beeps and nothing. I would remove the positive car connector from the 12v battery to isolate the car and battery from each other. Submitted: 13 years ago. My Edge had this issue as well. The output of an alternator is usually expressed in amperes, which is essentially just the amount of current that the unit is capable of providing to all of the equipment that’s hooked into the electrical system. turning on ignition etc and then go up in voltage to just over 14 volts when you start the car being charged from the alternator. I did leave by PAAK enabled phone in the front and I thought may be that was the reason. I charge to 85% and have not had this issue. A fully charged battery is nearer 13v than 14v. Category: Car. Shopping. it is running/on), the High Voltage battery should keep the 12V battery topped up. It always seems to "get better" and close automatically again after a charge. Your local automotive shop is more than able to load test your battery for … Load Test the Battery. XS Power has a battery for every form of racing with a wide selection ranging from 12 pound 12 Volt batteries to 14 Volt batteries for the street to 30 pound 16 Volt batteries. Show More. Info. Just curious, is there any misalignment on the rear hatch or something that would cause an excessive load on closing? If you’re readings are significantly higher or lower than these then it would indicate a fault with the battery and/or the alternator. Now bring your engine to about 3,000 RPM, then check the voltage reading on your multimeter and compare it to the specification on the owner’s manual. Charge the battery up to 14.4V and Maintain the battery at 13.6V for long time to avoid gasing and to extend the battery life. Tested in everything from 300-plus MPH salt flat cars to dirt track to circle track to drag racing to boat racing, XS Power has the only batteries you need for racing. The Gel battery will still be lead acid and the same data applies, even though charge and discharge rates may differ. Re: 12vdc battery reading 16v..? Once the car is running, it's the alternator's job to replace lost amps back into the battery and sometimes requires the alternator to provide extra voltage. Consider your car battery charged at 12.4 volts or higher and discharged at 12.39 volts or less. When this is occurring, the voltage reading on the 12V battery should read about 14V (as it's being charged). That should give about 14 to 15V, when the battery is fully charged, as other answers have said. Attach the 12-volt car headlamp to the positive(+) and negative(-) terminals of the battery. ... A voltage value of 12.7 volts and above indicates a 100 percent charged battery. Was not sure what caused it as it was Ok after forcibly closing it. Well i was wondering if i could swap my 12v car battery with a 14v battery seeing that my alpine amp has a higher output when using a 14v battery. 【12V Battery Load Tester】- The MP0515A 12V Battery Load Tester. Most car alternators, that normally recharge your battery after every start, and provide power while the engine is running, are normally voltage regulated to about 13.8 to 14.0 volts. A battery connected to a charger, when full will have a voltage of about 14.4v. A normal battery reads at about 12–14V without a load on it, with 12V being the standardized figure. I used to jump start my car every 3 days when my battery was knackered. … That was the fun one. If you like what you see, why not register with us for free, Technical Help Forum. well, assuming it to be a standard lead acid battery, you should check the water levels to see if too much electrolyte has escaped. Voltage on a fully charged battery will read 2.12 to 2.15 volts per cell, or 12.7 volts for a 12 volt battery . The Car Battery Amperage Hours Chat. The meter is now connected in parallel with the car battery and will display a reading automatically. What do I have to choose for Vrwm? if you see the plates above the water level then you are frying the battery. When your car is running the cars alternator is charging the battery, this is why you should see a higher voltage. Up to this voltage and at normal temperatures, the battery will only gas very slightly. Check Battery … Copy link. I had experienced this the first time while taking delivery. Likewise if you disagree with someone, as happens - after all we are all human and fallible, please think before you post. I have not tried it a lot though afterwards. More or less, a car charges from 13.8 to 14.4 volts... A true deep cycle battery can take charging in the 14.8 volt to 15.5+ volt range (fast charging), and 15-16+ volts for equalization. To get a useful voltage reading, measure the voltage with the battery connected. Regulators are temperature compensated to produce the voltage needed by the battery. Since the battery has 6 cells that means it should read 12.6V. Add a load and the voltage starts to reduce down to what it can chemically produce on an ongoing basis, not what it can store and quickly release to a lighter load device. This is a vital resource for members. Note the DC volts reading and compare with the table below, which indicates charge, under no-load, status: Car batteries provide 12.6V DC (direct current) through six cells, producing 2.1V each. If you have a reading of over 14.6 volts (14.8 volts or above) then the battery is being overcharged. (I think the DC/DC inverter can supply over 100A). If you'll notice, your battery says something like 690 cold cranking amps; this is the amount of electricity that is being sent to starter. This data and the way it relates to the design of your battery should provide you with some useful insight into the functioning capacity of your car battery. For a better experience, please enable JavaScript in your browser before proceeding. At 12.4 volts, a car battery is 75% charged while at 12.2 volts its 50% charged. A car has a 12V battery, and when the alternator is generating current the voltage is around 14V. I had to like get back in the car, start it, put it in gear, back to park, turn it off and it finally opened.