4 Tips For Choosing The Right 12 Volt Battery Charger

July 30, 2020 1 Comment

4 Tips For Choosing The Right 12 Volt Battery Charger


There are four things that you have to consider when choosing your 12 Volt Battery Charger. These things include FIRST AND ALWAYS - Safety, then comes  the ability to “plug and play,” and the capacity to combine desulfation with maintenance charging, and the capability to hold a full charge for a reasonable amount of time.

Before you actually start shopping for a 12-Volt Battery Charger, you need to ask yourself some basic questions:


  • What do you need the battery charger for?
  • Where are you going to use the battery charger?
  • What is mAH / AH capacity of your battery ?
  • What is the output of the battery charger you need ?


Your options may seem limitless, and choosing the right charger may be confusing, so here are four tips on how to choose the right charger for your 12V Battery Charger:


Determine the Type of Battery You Have


find the right kind of battery



You can find this information on the battery label or in the specs at the manufacturers website. It is usually located on the side or top of the battery. Most 12-volt batteries are lead-acid calcium, lead-acid and now even lithium. So, before you buy your battery charger, make sure to check your charger. It should be suitable for the type of battery you have.


Check the Capacity of the Battery That Needs Charging.


12-volt car battery

You need to know the Amp-hour (Ah) rating of your battery.(mAH for smaller batteries) These details are usually found on your battery’s label, which is usually placed on the side or top of the battery. If you are unable to find the information, you might want to contact the battery’s manufacturer or check their website.


aH x Voltage = Wattage - Ex. 50aH x 12V = 600W


Check out some of Mighty Max's reliable 12 volt batteries here


Know What You Need the Charger For


12 volt battery charger


Do you need to battery for charging? Do you need it for battery maintenance or both? Battery charging is when you need to recharge a dead or flat battery until it is full. Battery maintenance is when you need a battery charger for topping up.

So for instance, you have a motorcycle that you only use a few times a month, but you want to make sure that it’s ready anytime you need it.  This means you need a charger for battery maintenance and not battery charging. This is referred to as trickle charging. There are battery chargers that can do both maintenance and charging.

Some people need a charger to keep their car, motorcycle, or aircraft battery charged when not in use. In cases like this, a low current charger would be sufficient for this. Other batteries may need an even faster and more powerful charger.  This is what you will need for a wheelchair battery or trolling motor battery.

You may also consider other types of charger specific to your needs.  For instance, you might need a multi-voltage battery charger if you’re traveling, a waterproof charger for when you’re outdoors, a charger than works as a power source for RVs, and a multi-bank charger for when you’re planning to charge several batteries all at once.


Make Sure to Select the Correct Charger Output



12v battery charger


As a rule of thumb, your charger should be 10% minimum of your battery’s Ah rating. This means a 100Ah battery would need a 10 Amp charger minimum. You can increase the battery charge amp if you need the battery to be charged at a faster timeframe. 

Choosing the right battery for your device is only half the story.  You also need to choose the right battery charger to charge, maintain, and condition your battery. This is important especially when your battery starts showing signs of aging.


Additional Tips on Choosing the Right Battery Chargers


Buying a low-cost charger to save money will only shorten your battery life rather than extending or prolonging it. Make sure to avoid battery chargers without “end-of-charge control” as this creates huge output current, which just ruins your battery.

You might want to avoid “trickle rate” chargers that do not include automatic float mode or current control circuitry. These chargers can end up overcharging your battery. You might want to look into pulse-type chargers instead. These chargers feature end-of-charge controls, which help minimize the buildup and decrease the time necessary to charge the battery fully.

You might also want to check de-sulphating equipped conditioner chargers in the early life of your battery. This will help guarantee optimal battery performance and longer battery life.


Tips on How to Use Your Battery Charger Properly


To maximize the use and life of your battery charger as well as the battery itself, you should know how to use your battery chargers properly:

  • Avoid connecting an unregulated “automatic” charger to your battery overnight unless it is shut off entirely.
  • Store your battery in a well-ventilated place with a temperature that does not rise over 25°C.
  • Each 5°C over 35°C reduces your battery life by one year.
  • Calculate the total battery charge time properly. The rule of thumb is to take your battery’s amp-hour, divide it by the charger rating time (amps), and then add about 10% extra time for top-off charging.


 How Do You Charge a 12-Volt Battery? 


To charge your 12-volt battery, you only need to connect your battery to the charger by attaching the BLACK negative cable from the charger to your battery’s negative terminal. Secure the clips to the terminal properly. Connect the charger’s positive cable to the battery’s REDpositive cable.  Look for the ‘+” mark to confirm the positive terminal.

Your battery determines the charging time. The more discharged it is, the longer time it will need to charge the battery. It may take up to 12 to 24 hours to charge a 12-volt battery fully, but make sure that the charging heat doesn’t go over 125°F.

The best way to charge a 12-volt battery is to charge it slowly. The rate of charging varies depending on the type of battery that you’re charging. A 12-volt automotive battery, for instance, can take a long time to charge. In fact, slow charging is ideal for automotive batteries.

Charging your battery with a premium grade charger is essential to its capacity and longevity. We would recommend NOCOS as the industry leader in low voltage battery chargers.

1 Response

James Devaney
James Devaney

January 18, 2022

Hello I have a powerline PTX5L-BS 12v 5Ah 80A battery in a petrol quad. I can’t find the original charger anywhere and I fear the battery is almost flat. Any help with this would be much appreciated thanks

Leave a comment

Comments will be approved before showing up.

Join The Coolest Low Voltage Network.