Remember that a fully charged battery that has rested unused will read 12.5 volts. In a similar vein, if you notice your headlights or dash lights dimming, a charge warning light flicks on, or the voltage meter on your dash drops below 14.2 volts, those are all indicators that the alternator isn’t charging the way it’s supposed to, which can also lead, very quickly, to an overly-discharged battery. Reducing final time by 15-20% is a conservative way to estimate if you have an older battery. 22.6 - 28.8 Days. Divide times by half to get the 50% time so that you might still start your car. 29 - 54 Days. If you check battery voltage after shutdown it will be higher. When a discharged battery is disconnected, the voltage will rise back to near normal. A multimeter is designed to put as little load as possible on a circuit. Sitting there not connected to the car and voltage dropping like a rock without even applying a load such as a radio or park lamps. Car batteries have a resting voltage somewhere between 12.45 and 12.6 volts in most cases. A regulated charger will hold the voltage to 13.5 to 13.8 volts once the voltage has peaked, to prevent gassing and overcharging, and the current will drop to almost zero in a healthy battery. Check for amp draw at the battery terminals with an amp meter. https://www.doityourself.com/stry/what-makes-battery-voltage-drop Car batteries can die for a huge range of different reasons, and there’s always the chance that whatever went wrong won’t go wrong again. Alternators typically put out 13.8 volts. When a battery goes from 12.6 volts to 7 volts in half an hour while sitting on a bench it has a problem. www.delcoremy.com/the-latest/2013/june/tech-tip-checking-voltage-drops Your vehicle’s charging system, however, operates at a slightly higher voltage than the battery’s voltage and does so for several reasons. Went through this just a month or so ago actually. I have 30 SMF battery of 12V/100AH.The floating voltage of all battery is between 13V-13.80V but after testing with load the voltage drop down upto 10.50V.The 10.50v battery is considered weak battery .please reply us. https://www.modernthrill.com/2019/causes-of-overnight-car-battery-voltage-drop Batteries are normally tested with a dummy load. Times based off batteries in excellent condition at 100% beginning charge. It means the battery is dead. When your car battery dies once, it may be tempting to just write it off as a fluke. The only way to find it. I assume you are talking about a 12 volt battery. Gassing due to overcharging also "uses up" the water in your electrolyte, and in sealed batteries will fairly soon ruin the battery. Results are days until 100% discharge. I am expecting a reasonable charger will charge the battery up to about 13.8 volts and maybe 14 volts. The answer will not be exact because the final charge voltage is not known.
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