AA batteries plays a huge role on the daily routine of almost all households. They may seem to be small, but they are behind of a lot of activities within the house. You will commonly see on battery powered toys, wall clocks, television remote and various electronic devices. These batteries have been with us through the entire course of our modern life. I mean who doesn’t recognize the Energizer Bunny?!
For decades, we are using AA batteries to power out trusted, handy electronic devices at home or at work. They also evolved along with our growth to offer better performance through the years. One innovation that is very helpful to use is the introduction of rechargeable AA batteries. As progress comes along, they slowly improve offering higher storage capacity and longer life expectancy. However, no matter what upgrades they’ve had, it seems that users expect more. In this article we are going to study the basics of a AA battery voltage range and other important information, allowing us to understand the limitations that they have.
To begin understanding these batteries, we start of by defining them and learning what they are made of.
What is A AA Battery?
AA batteries are standard sized dry cell batteries composed of a singular electrochemical battery cell that either be disposable or rechargeable. These batteries are widely used to power various portable electronic devices with capacity and voltage that vary according to the chemistry of the battery cell. But typically, the devices using these batteries are designed to only take 1.5 volts.
The American National Standards Institute or ANSI standardized the size of AA batteries in 10947 but they were introduced 1907. A battery with the AA size measures 1.94 to 1.99 inches lengthwise and 0.53 to 0.57 inches diameter wise. The weight of a AA battery also varies according to its cell’s chemistry and they are listed below:
● Alkaline AA Battery – Roughly 23 grams
● Lithium-Ion AA Cell – About 15 grams (Not Applicable)
● Ni-MH AA Battery – Around 31 grams
Understanding How These Batteries Work and Their Range
End voltage is defined as the amount voltage within the cell where it is considered to be depleted. Once this remaining amount of voltage within the battery cell, it will lose its ability to store charge. Then the deterioration of the cell begins.
The specific voltage of a AA battery is different depending on the chemical structure of the cell within it. But the typical end voltage is normally considered as 90% of the initial voltage of the battery. With that said, the best method to determine the end voltage of a battery is by application.
To understand this theory. Let us take a look at it this way.
Most electronic devices are designed to have a specific amount of voltage that causes it to fail. This is the point where the device will prevent improper functions by cutting itself off, if the device is powered by multiple batteries, that amount will be total voltage divided by the number AA cells. The range of this amount of voltage for portable devices is typically between 1.0 volts to 1.1 volts and can even go down to 0.9 volts.
The battery review website has mentioned that when the devices have lower amounts of end voltage, this will allow them to operate longer with a single charge. This is why manufacturers of disposable batteries prefer showing the discharge curve against time rather than the Amp hours. Another reason is the varying capacity of batteries based on the current discharge rate.
Digging A Little Deeper on the Range of the Batteries
The obvious thing that we will see with regards to this issue is that batteries have varying range depending on their battery chemistry. A regular AA battery which is a an alkaline battery has a 1.5 nominal voltage charge, but when it is fresh or brand new, it will have 1.65 volts. That is the full capacity of an alkaline battery but when it reach about 1.4 volts, it will be considered dead.
In the case of rechargeable batteries with a an NiMH battery chemistry. It’s nominal voltage will be at 1.2 volts and when it is at its fully-charged state it will have a maximum charge of 1.65 volts. Rechargeable batteries like this are considered dead if they reach their 100% depth of charge, their voltage at this point will measure less than 1.2 volts.
When it comes to a lithium ion battery chemistry, a single native battery has 3.7 volts which is considered to be too much for electronic devices. This makes them dangerous for both the end consumer and the electronic equipment. AA and AAA batteries with lithium ion chemistry will not work out.
The voltage that this chemistry has far to too great that a single cell with this chemistry even has more voltage than two alkaline batteries. However, there are no electronic devices designed to use a battery like this. So, there are no manufacturers are producing AA and AAA lithium ion batteries.
By studying and looking deeper into AA batteries. The best way to say is the AA battery voltage range will be dependent on the chemistry of the cell. However, the average maximum voltage of AA batteries are set to be 1.65 volts regardless if the battery is disposable or rechargeable. When it comes end voltage, that will depend on the chemistry along with the device they are used. So the range can be dynamic and it is affected by several factors. Return to the homepage here.