Loading... Please wait...

Categories

Blog

How to choose the correct battery charger?

Posted by


How to choose the correct battery charger?



1. What do we need to know about chargers?

Firstly, we need to be aware that there are different chargers with different outputs. For example, their voltage output may vary from 6V to 12V and 24V. There are different output currents as well as overcharging protection. Typically these chargers are equipped with overload protection, back-up protection and short-circuit protection.

Most newer chargers adjust the charging current and voltage automatically. For proper charging, the current of these chargers should not exceed 10% of  the battery capacity. For instance, if the battery has a 70Ah (Amp/Hour) capacity then the charging current should not be higher than 7 Amps (A).

The lower the current, the more it takes to fully charge the battery. We already mentioned that there are different overload protections. First type of overload protection is when a green lamp lights up and the charger turns off automatically. Second type is when the charger uses a trickle charge to just maintain the reserved power inside the battery without overcharging it. The second type of overload protection is mainly used for off-season batteries such as for ATVs, UTVs, motorcycles, etc.


2. Charging SLA Batteries:

We strongly advise to charge a battery only in a well-ventilated room since gas is released during charging which is flammable and poisonous. Also, avoid contact with the electrolyte because a dissolved sulfuric acid is created during the recharging.  If by accident, acid spills on your clothes it will damage them so you should use a baking soda to neutralize the effect of the sulfuric acid.

If you need to charge a 12V battery then you will have to use a 12 volt charger. Same applies for 6V batteries - 6V charger is required. Chargers that have 24V output charge two 12 volt batteries simultaneously. Before purchasing the charger you need to make sure that the charger voltage matches the battery voltage. The aforementioned 24 volt battery set is a result of two 12V batteries connected in series, which use the a 24 volt output. They can also be charged separately. Hence, the two 12V batteries will have to use two 12V chargers. 

3. For how long should I charge my battery?

There is a simple formula used to calculate the charging time of a battery. For example, we have a 12 Volt 7 Amp Hour battery and a 12V 1 Amp Charger. The formula is: (7*1.3)/1 which gives us approximately 9 hours of charging. This formula is under the assumption that before recharging the battery is completely discharged which is rarely the case. 

In other words, to estimate the charging time you have to multiply the AH of the battery by 1.3 and then divide the result by the amperage of the charger. 

4. Choosing the correct charger:

Simply said, the higher the amp hour of a battery, the higher the charger amps you will need to charge the battery. However, for maintaining  the charge a lower amp charger will work just as well. We have prepared a table that will hopefully make things easier when choosing the correct charger for your battery:



Battery AH

Charger Amps

Under 7AH

500 mAh - 1 Amp

7AH - 20AH

1 Amp - 2 Amps

21AH - 40AH

2 Amps - 3 Amps

41AH - 75AH

3 Amps - 5 Amps

76AH - 100AH

6 Amps - 10 Amps

101AH - 125AH

10 Amps - 15 Amps

126AH and up

15 Amps - 20 Amps

Visit our Charger Category

BatteryRush.Com

View StoreContact us

Twitter Facebook


Basic Battery Terminology

Lorem ipsum dolor que ist Basic Battery Terminology We noticed that quite often, people have difficulties when choosing the battery that would best fit their applications which is due to a large number of letter abbreviations and technical terminology related to the them. Therefore, we decided to write a short article that would [...]

Read More »


How to recycle lead - acid batteries and why it is so important?

Lorem ipsum dolor que ist How to recycle lead - acid batteries and why it is so important? After your automotive, motorcycle, UPS or wheelchair battery gets completely discharged and no longer [...]

Read More »


UPS Specifics and Maintenance Tips

Lorem ipsum dolor que ist UPS Specifics and Maintenance Tips An uninterruptible power supply or uninterruptible power source (UPS) is an electrical apparatus that provides emergency power to a load when the input power source fails. A UPS differs from an auxiliary power system or a stand by generator with the ability to [...]

Read More »


Snowmobile Maintenance Tips

Lorem ipsum dolor que ist Snowmobile Maintenance Tips It's our favorite time of the year again and if you, just like us, are a snowmobile enthusiast, then you should be aware of a couple of important steps that will keep your machine in good shape and would ensure your safety better, while on [...]

Read More »


A Little More About Deep Cycle Batteries

Lorem ipsum dolor que ist A Little More About Deep Cycle Batteries The deep cycle batteries, as we can tell by the name, are designed to deliver continuous power and to be regularly discharged to their maximum capacity. Thus, they would be the most suitable batteries to get for your wheelchair, scooter, golf [...]

Read More »


BCI Battery Group Size – What it actually is?

BCI Battery Group Size – What it actually is? We, at Battery Rush have noticed that when it comes to replacing your old UPS, SLA, Wheelchair or Motorcycle/Automotive battery with a new one, very often there is some confusion about the BCI Group Size. So, we will provide further details bellow and [...]

Read More »


Alkaline Batteries - Essentials

Alkaline Batteries - Essentials Alkaline batteries form 90% of the battery market in the USA and, with no doubt are the most commonly used batteries that we use on various devices such as remotes, cameras, MP3 players, toys, lamps, radios, etc. Let’s take a closer look at what is inside them and [...]

Read More »


Ultimate Guide to Battery Basics

Ultimate Guide to Battery Basics We all know the feeling of getting buried in information when purchasing battery for the first time, in an attempt to get the correct one. Well, let’s clear that information a bit so you can get the most out of it. This guide simply aims at making clear what lead acid batteries [...]

Read More »


Difference between Ni-Cd and Ni-Mh battery?

Difference between Ni-Cd and Ni-Mh battery? Both nickel-cadmiumand NiMH batteries are rechargeable.The greatest distinction between the 2 is that NIMH batteries provide higher energy densities than NiCads. In other words, pound for pound, NIMH delivers just about 30 min additional capacity than its nicad counterpart. What this nterprets into is enhanced runtime from the battery with [...]

Read More »



 

Follow us on

Copyright 2019 BatteryRush.com. All Rights Reserved.
 Sitemap