Maybe, maybe not. It'll be a 33% overload. Some things will deal with that just fine, others will fail immediately.
6 volts
To change the voltage of a 12-volt battery to a 6-volt output, you can use a voltage regulator or a step-down transformer. A voltage regulator will reduce the voltage to the desired 6 volts, while a step-down transformer will step down the voltage from 12 volts to 6 volts. Both options will help you achieve a stable 6-volt output.
To test a 6-volt regulator, first ensure it is disconnected from the power source. Use a multimeter to measure the input voltage at the regulator's input pin; it should be higher than 6 volts. Next, measure the output voltage at the output pin; it should consistently read around 6 volts, indicating proper regulation. If the output voltage is significantly lower or higher, the regulator may be faulty and should be replaced.
A little more than 6 volts RMS, or 17 volts peak to peak (can get -6 and +6 voltage this way using a full wave rectifier). The voltage will depend strongly on your design - are you using circuitry that clamps the output voltage to a specific value (you should!). If you are doing this, I would find the cheapest transformer that meets the current capacity you need that has an output near the 6 volts you want.
Voltage Outputs of Lead-Acid BatteriesThere are many different sizes of Lead-Acid batteries and the voltage output can vary.For example:Some security/alarm systems use Lead-Acid backup batteries which are either 6 Volts or 12 Volts.Similarly, emergency lights [like over doorways and hallways in commercial buildings, hospitals, etc.] use Lead-Acid backup batteries for powering the lights during power outages, and these can use either 6 or 12 Volt batteries.Most automobile batteries are 12 Volts.Some heavy vehicles [large trucks, heavy construction equipment vehicles, etc.] have 24 Volt batteries.Various aircraft use different voltage output batteries.The output voltage is dependent on the number of "cells" in the battery. A fully charged Lead-Acid cell has an output of 2 Volts DC [Direct Current].Therefore, if a battery has two cells, then the output voltage would be 4 Volts DC. If it has 3 cells, then the output voltage would be 6 Volts DC, and a battery with 6 cells would have an output of 12 Volts DC. And 24 Volt batteries have 12 cells.That is the basics. Now, there is an exception.IF the battery is "overcharged," then it can accumulate what is called a "surface charge" which goes slightly above the 12 Volt nominal output, and usually is about 1 extra volt, and that surface charge will "wither" away within a few minutes to an hour, even without using the battery. If the battery is used, then the surface charge is drained off immediately.
That is Impossible. You can however make two 6 volt batteries into a 12 volt system by wiring the two 6 volts batteries in Series. You will then have an output voltage of 12 volts but the amperes will only be what one of the batteries have, In other words the volts will double but the amps will stay the same as if you only had 1 battery connected.
Don't know what your intentions are but the 6 - 6 volt batteries would probably deliver more amps. ======================================= -- If the batteries are connected in series, six 6's are exactly equivalent to three 12's. -- If they're operated in parallel, then the terminal voltage of six 6-volt batteries is still just 6 volts. There's no way to connect 12-volt batteries and make them look like 6-volt units in parallel. It's really important to find out exactly how the original 6-volt batteries are connected in the device. 1). They may be all in parallel, giving an output of 6 volts. 2). They may be all in series, giving an output of 36 volts. 3). They may be connected in three parallel branches of two series units each, for an output of 12 volts. 4). They may be connected in two parallel branches of three series units each, for an output of 18 volts. If you know what you're doing, you can replace them with 12-volt units in cases 2). and 3)., but not in cases 1). or 4).
A single lead-acid battery cell typically has a nominal voltage output of about 2 volts. Therefore, a six-cell automotive battery, which is commonly used in vehicles, has a total nominal voltage output of 12 volts (2 volts per cell x 6 cells).
use a potential divider with R2 and R1 being 100 ohms
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the rest of the cells are dead or you are using a charger that only has a output pressure of 6 volts.
Yes as long as it is the right voltage: a 6v battery needs a 6v charger; a 12v battery needs a 12v charger. <><><> If you can set the battery charger's output to give either a 6 or a 12 volt output, then you must always remember to set it to 6 volts if you want to use it to charge a 6 volt motorcycle car battery.