A Noob's Guide to Charging a 12 Volt Battery?

July 25, 2019

charging a 12 volt battery

Do you need to charge your 12 volt battery? 

How should you do it? 

How long does it take?

Just charging batteries may seem quite simple, but there are interesting facts that you might want to know about beforehand.

In electrical terms, volt the electricity pressure that flows through a cable.In this case it would be 12 VOLT.  Amps is the unit that is used to measure the current required to charge a device.  When you multiply these two, you get the wattage.  This is your power consumption. 

Sooooo. How Do You Charge a 12-Volt Battery?

Connect your 12-volt battery to the battery charger by attaching the BLACK negative cable from your charger to the negative terminal of the 12-volt battery. Make sure to use the clips or clamps to connect to the terminal securely.  Generally, the negative terminal is labeled “ –.“  You also need to connect the positive cable from your charger to the RED positive cable of the battery.  You’ll find the “+” mark on the positive terminal.

Leave your charger on for as long as you want.  This won’t damage your battery. Check the battery charger display to see when your battery is fully charged. Disconnect the cables, and now your battery is ready to use.

How Long Does It Take to Charge a Battery?

The more discharge your battery is, the longer it takes to charge it fully.  Yes, batteries take time to recharge. It could take hours.  A 12-volt battery could take up to 12-24 hours to charge fully.  When recharging your battery, remember that if it gets too hot while you’re charging it, you need to stop charging.  It should not get too hot above 125 Fahrenheit.

Ideally, slow charging your batteries is the best option.  Of course, the rate varies depending on the kind of battery that you’re charging and its capacity.  A 12-volt automotive battery, for instance, takes a while to charge.  In fact, fast charging for this kind of battery is not recommended.  10 amps are the recommended current. This is a slow charge. 20 amps are already fast charging. Repeated fast charging could overcharge your battery. This could reduce the battery’s service life in the long run.

In order to determine how long it’ll take for you to charge your battery, you need to know your battery’s reserve capacity and your charger's output charge current. A 100aH battery that is being charged by a 10A charger will be fully charged in 10 hours.

How to Charge a 12 Volt Battery?

 How Do You Know If Your Battery Has Been Charged?

The answer may be simple and at the same time, not that simple.

The simplest method, however, would require you to use a voltmeter to measure the positive and negative terminals.  You need to leave the battery alone for at least a couple of hours after charging.  For a 12-volt battery, the voltage measurement between those two terminals should be between 11 and 13 volts – the closer the measurement to 13, the closer the battery to being charged.

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