A car battery should have a voltage in the range of 12.8 to 13.2 volts in order for it to be considered healthy and fully charged. a bad alternator or regulator can lower the voltage considerably, so when these parts are replaced, you'll see a noticeable increase in battery life.
in addition, when charging, the charger should maintain 13 volt charge without going over 14 volts unless otherwise specified by your vehicle's manufacture guidelines because if something goes wrong with this setting during charging, then lithium ion batteries may become damaged and will need replacement sooner than needed if your low-voltage end time is shorter than usual.
finally, what you want to do is continue to use a trickle charger after it reaches full
what voltage is too low for car battery?
low voltages can be managed by a battery charger or a solar panel, but a fully-charged battery should be higher.
worst case scenarios will vary based on the make and model of your vehicle, as not all vehicles support low voltage operation. for example, some manufacturers only allow starting using a lower voltage after the engine is warmed up to operating temperature due to their built in protection circuitry that will auto shutdown the engine when it becomes too hot. when this happens, one would need to find an atv shop nearby with jumper cables in order to get started again. the best thing you can do is check what type of battery system your car uses before getting stranded out in the middle of nowhere!
maintaining proper fluid
is 11.9 volts enough to start a car?
no. this voltage is not enough to start a car, at best it'll make the starter turn, but unless there is spark voltage in the wires to trigger the engine, it will not start.
some battery companies will call their 12 volt battery an “11.9 volt” battery if they determined that 11.8 volts was their lowest current level measured on some 100% charged new batteries at room temperature before they shipped them out for sale or use by others (that's what happened with ours). so essentially instead of seeing false hope on this answer – think of this as me telling you first openly so you can learn for yourself – your car won't start because there isn't enough power coming from the 11.9 volts input
what should car battery voltage be while driving?
the car battery voltage should be at 12.5 volts while driving.
generally, when you drive your vehicle in stop-and-go traffic or in areas with commercial buildings, the alternator is not able to keep up with the electrical load and so your car's engine may be used as a power backup for all of the things that typically run on dc current, like headlights and radios. as this happens, there will be less pressure to maintain pre-installed accessories that operate at ac current (like ac powered windows). so if you lose ac style power before changing your car battery voltage to 12.5 volts when driving then it may take just a little over one week before your car will no longer start due to low battery voltage
is 12.2 volts enough to start a car?
voltage is not enough to start a car because the voltage operates at a lower amperage that what's needed to start the vehicle. although voltage produces an amount of wattage, it does not produce enough amps needed by most vehicles.
in addition, there are other concerns such as a design design issue or a wiring problem in the ignition system or fuel pump system that will cause instantaneous resistance and render 12 volts basically useless for starting an engine no matter how many amps are put out from it.