A voltage reading of 11.8 volts or lower is a strong indicator that the battery is dead or failing. At this point, the battery is deeply discharged and may no longer hold a charge effectively.
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It''s harder to interpret rested voltage in a modern car because any significant current draw pulls the voltage down but if the car was truly at rest and drawing negligible
View moreInternal battery and wiring resistance are the cause of the lower voltage. Batteries have a specific rate of discharge, once the rate for your batteries is exceeded along
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View moreGenerally voltage at the battery (after 10-20 min of alternator charging) should be around 14.1~14.5v. If it''s more than 1-2v volts lower, then probably bad alternator function (which can be caused by a loose or deteriorated belt - may not need a new alternator) or some hefty
View moreSome say it runs for a long time and charges up quickly, while others report that it stops working after only 10 minutes even though the battery was fully charged. The battery life is also mentioned to be 20-30 minutes or less, and the recharge takes over 2 hours.
View moreIn the MyFerrari app it shows my "Low Voltage Battery" at 11.8v consistently. That''s even when everything says fully charged. Is that normal and...
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View moreBatteries while starting should not drop below 9.5V and a good working alternator with a good battery should show roughly 14V. So, if the 11.8v is with the car running that is not good, either the battery has a dead cell or your alternator is
View moreBatteries while starting should not drop below 9.5V and a good working alternator with a good battery should show roughly 14V. So, if the 11.8v is with the car running that is not good, either the battery has a dead cell or your alternator is
View moreA car battery voltage reading of 10.8 volts means that the battery is not receiving a full charge and may need to be replaced or tested further in order to determine the cause. A fully charged car battery should
View morePut it in charge mode but the charger is only reading 12.5 volts. Usually it charges at over 13 volts so im wondering if a low state and 11 volts is a low state the charger will put out 13.6 or greater and gradually lower the voltage as the battery charges. With batteries it''s always better to know to the tenth of a volt how things are
View moreRichard asks, "When I''ve discharged my AGM (L16) house batteries to anywhere near 50% SOC the voltage reads about 12.1VDC. If I were to take the bank down to...
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View moreYou need a charger that will charge your deep cycle battery slowly and in stages. If you having trouble even starting charging your battery, then this could be a problem. Only a specialized
View moreTo understand how much to charge a 60ah battery, firstly you must determine the degree of sparsity of the battery. The average time to charge a dead battery is 10 to 12 hours. If a 60ah battery is put on charge at 6 amps when it has only
View moreTo charge a lead-acid battery, the charger applies some charging voltage to the battery and, if you measure the battery voltage at that point, you might conclude that the battery is fully charged.
View moreIf your battery is reading this low and is 3 years old or more, it is time for replacement. If the battery is not that old, try a slow overnight trickle charge and recheck it again.
View moreHide Transcript. Transcript is auto-generated. hi rs jeff cote here with ask pys so we''ve got a question from richard and richard''s a fellow boater uh and he''s got a battery bank of agm 16 house batteries and when he discharges his battery bank and about 50% state of charge which is sort of if your battery bank is 100 then 50 is in the middle so sort of another term for that is 50
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View more11.8 is what my battery was last month before I bought a new one, because if I would listen to the radio for just a few minutes the car wouldn''t start. I replaced it with a new
View moreSo you''ve been charging your "12V" battery for a while and only gotten to 13.8? Well... 9x 1.48 is 13.2V. So what your battery charger is likely doing is still trying to stuff current in on slow charge, and over-charging 9 good cells and one bad
View moreOne battery charges up and holds the charge.....the other does not. bruceb58 Supreme Mariner. Joined Mar 5, 2006 Messages 30,548. Nov 17, 2016 #8 Worst thing you can do for a lead acid battery . Only run it down until it gets to 12.0V and stop discharging at that point.
View moreThe voltage on a lead acid battery as an indicator of state or charge is only valid when the battery has been sitting for a while (an hour or so?) without any load. The voltage dropping under load is normal. 11.8 volts with only the furnace as a load seems a bit large to me, but probably OK. Gary . 136 WB PM1500, high roof, gasser, 2014. SW Montana
View moreIf you just bought a new battery but failed to charge it before you installed it and ran the starter, your battery is toast. Buy a good quality AGM battery of the proper size and capacity. Buy a NOCO Genius 1 battery charger/maintainer. Read
View moreYou may be confusing charging voltage suggestions with the static charge of your battery after charging. It requires more voltage than the "fully charged" state to reach that level. This would be the 14.4 - 14.8 (or thereabouts) your charger is utilizing. The only thing odd I have noticed about the discharge curve so far is when I
View moreUnderstanding what different voltage readings mean can help you maintain your battery, prevent breakdowns, and ensure your vehicle runs smoothly. In this article, we''ll delve into car battery voltage, what it tells you
View moreAt What Charge Percentage Should a Car Battery Be Replaced? While a car battery typically needs replacement when its charge drops below 25 percent (around 11.8 volts at 80°F), this isn''t always the best indicator of its health. A battery can show a full charge but still have internal damage preventing it from holding a charge.
View moreIf your 12V battery charger shows a charging voltage you can expect it to be around 14.0 to 14.8V for a typical Flooded lead-acid battery. If you have a 12V battery monitor (the best 12V Bluetooth battery monitor are the BM6, followed
View moreA fully charged battery will read EXACTLY 12.6 volts across the terminals. There are 6 cells in the battery, each having 2.1 volts If your battery is reading this low and is 3 years old or more, it is time for replacement. If the battery is not that old, try a slow overnight trickle charge and recheck it again.
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View moreFor instance, a total voltage of 12.1 volts means that your battery is operating at only 50% of its total charge. Once it drops down to 11.8 volts, the battery is almost completely discharged. They shut off once the
View moreIf your battery consistently shows this voltage, it might be time to check the charging system or consider charging the battery with an external charger. 12.0 to 12.2 Volts: Low Charge. A battery in this condition may not
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View moreWe noted that 12.6-12.7 Volts is the normally voltage for a fully charged battery, and showed which voltages correspond to which approximate charge % level. Be aware with analysing voltage – it doesn’t show the health of the battery per se, it just shows how much charge is in the battery at the moment you measure.
11.8 with ignition on engine off can be perfectly fine. What is the voltage 30-45 minutes after turning the car completely off, key removed? What is the voltage at idle? If that 11.8 while idle. That is bad should be around 13-14.5 idle. Check charging system (alternator,voltage regulator)
Here’s what various readings typically mean: 12.6 to 12.8 Volts: Fully Charged This is the ideal voltage range when the engine is off, indicating that the battery is capable of holding a full charge. A battery in this voltage range should have no trouble starting your car and powering all electrical components.
It also changes according to the weather; a 12V car battery’s voltage falls in low temperatures. As a result, then, if you measure could be that your vehicle battery’s voltage is 12.5V and yet it’s actually fully charged. The same applies if your battery has been around the block a few times ie. it’s getting old.
When the engine is off, a fully charged car battery should have a total voltage of around 12.6 to 12.8 volts. When the engine is running, the alternator increases the battery’s voltage to between 13.7 and 14.7 volts to keep it charged. Voltage is a key indicator of the battery’s state of charge.
The starting voltage of 10.0V is something you’ll typically only see on a battery monitor which logs a voltage graph over time. The voltage graph will dip sharply down to 10V, then rapidly spike up to the typical running voltage range, as mentioned immediately above, of 13.4-14.7V. Do your resting voltage results indicate the health of the battery?
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