With the car turned off and not charging, have you measured the voltage across the auxiliary battery? If your battery is in good condition, the voltage should be between 12.4 and 12.7 volts. Bulk Charge - The first stage of 3-stage battery charging. - posted in Problems, Questions and Technical: After leaving my car a 1 or two days without a run, the car always starts but it is quite labored. Therefore, voltage in a battery pack within a golf cart will be comparable to the horsepower in a car. When the battery charger is first disconnected from a fully charged battery, there is for want of a better way of describing it, some surplus leccy left on the plates and the voltage reading is higher than the 12.7. The next thing to check is the charging voltage with the engine running above 2500 rpm; it needs to be close to 14 volts +/- .3. Charging a 12-volt battery using a 6-volt setting is easily possible, but it takes twice the time. If that lower end is zero, then *percentage* on the meter is not really useful as a pack with, for example, 20% voltage may have reached the low voltage cutoff? There is a TSB on the Gen II Prius that a defective 12-volt battery can create a problem when trying to refill the gas tank. This erodes away over a period of time ( hours) and the battery settles back to its fully charged 12… The small fan heaters have safety overloads and heat is automaticallly adjusted. Electrolyte gravity voltage test. Many false codes can be created when a worn out 12 volt battery is left in the car. 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. … That is because each of the six cells in a 12-volt battery should measure at least about 2.1 volts when fully-charged. But, there is a good chance that will take your system well below 75% state of charge. The most common battery voltage is now 24 volts and soon 48 volt systems will be the most popular. They are producing a false "low battery voltage" warning. With your multi-meter, measure the voltage across the battery's two terminals. If the voltage is less than 12.4 volts (for a 12 volt battery) or 24.8 volts (for a 24 volt battery), which is typically 75% of charge, the battery may be too heavily sulfated to be fully recoverable. The shock from a car battery will not kill you. A 12 volt battery is just a nominal figure of speech. Each battery is complete with 6 separate cells that each contains 2.1 volts, for a total of 12.6 volts. The resting voltage of the battery is around 12.5v - is it time for a new battery? Applying an equalizing charge by raising the voltage of a 12-volt battery to 16 volts for 1–2 hours also helps by mixing the electrolyte through electrolysis. In most cases, charging the battery or allowing the car to stay running for 30 min will reset the low battery warning message. Homesteaders building renewable energy systems should avoid 12 volt battery banks with the following exceptions: 1. Not all clamp meters can measure DC Current, but most will do A/C and D/C voltage, but only A/C amperage. If the reading is lower than 12.2 volts, "trickle charge" the battery, which is a slow charge. Allowing the battery to rest for a few days, doing a shaking motion or tipping the battery on its side helps correct the problem. Current is sent to batteries at the maximum safe rate they will accept until voltage rises to near (80-90%) full charge level. Since the charger is responsible for charging your vehicle's battery, you want to make sure that it is working, that there is no resistance in the lead wires, and that the voltage coming out of the charger is what it should be. 12-19-2003 01:49 AM. It’s is a Brand new Battery And I fully charged before installed it. These numbers assume 100% healthy cells, and may vary a bit lower for older batteries. Volvo low battery warning may come up for several reasons, but the most common problem is a partially discharged battery. Also, most modules on a vehicle will set a code if low system voltage is detected. This is a simple circuit that will indicate a low voltage on a 12V lead acid battery. With this knowledge in place, we can determine a 72 volt system can be more powerful than a 48 volt system, and a 48 volt system can be more powerful than a 36 volt … The truth is, most 12-volt batteries need to measure at least about 12.6 volts before they are considered fully-charged. This voltage will be enough to fully charge or maintain the battery on a trickle charge, but charging time will be very long at 13.8 volts. Hello all. Charging your battery with a four amp charger will take about 12 hours to get a full charge out of this low amperage. Twelve volts is just a nominal, convenient term used to distinguish one battery from another. If your car battery voltage is discharged, or has less than 12.4 volts, the power decreases dramatically. Testing the Battery. So I took my car to Les Schwab and they said that it was fine. For instance, a deficiency of six tenths of a volt can lead to a power loss of up to 75%. Re: Which Low Battery Cut Out Voltage to Use? I asked them what the voltage was and they said about 12.1 voltage. 12.6v is the optimal battery voltage. The normal size of a battery cell is 2.1 - 2.3 volts, so if the battery was bad, or going bad, your voltage … It doesn't matter if the bike starts or not, what you're looking for is a voltage reading. Heating with the small fan heaters is reliable and safe. Though after a run the car fires right up. It does not have to do with fuel. What lower end does the voltage meter on my Bafang/Luna Cycle DPC-18 use to calculate percentage? In fact, under normal conditions, a 12-volt car battery will usually not even shock you. And then re-check. For the voltage under load (when your Prius is in "Accessory" mode), anything below 12.0 volts is unacceptable, At the time of testing, when these photos were taken, I had just finished a long drive in my Prius so the battery should have been at a higher voltage than what I found above. A reading lower than 12.4 volts means that your battery needs to be charged. The funny thing was when at 12.2 v it would not matter the rpm I was at the volts did not go back up. Depending on the load on the electrical system, anything higher than battery voltage is good voltage for a vehicle. You are lucky to get 5 years of service out of a car battery these days. 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