【New Product】XTAR 1.5V AA 4150mWh Battery

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【Updated】 More about 1.5V AA/AAA Li-ion batteries’ runtime

Batteries’ runtime may be influenced by a multitude of factors, such as, battery type, device power consumption, voltage and current requirements, self-discharge rate, environmental conditions…

For example, you compare two batteries with the same capacity. One for the rechargeable 1.2V NiMH AA and another for 1.5V Li-ion AA battery. The 1.5V Li-ion battery can maintain a constant 1.5V voltage output. While the voltage of the 1.2V NiMH battery gradually decreases during discharge. They have different discharge voltage curves.

If these two types of batteries are used in low-drain devices, such as alarm clocks, TV remotes, these devices require a relatively broad voltage range, and it can work normally even at lower voltages. However, if a constant 1.5V high voltage is continuously applied, the 1.5V Li-ion battery will be quickly depleted. As for the 1.2V NiMH batteries, the energy will be depleted at a slower rate, and the runtime will be longer.

For some medium or high-power devices, such as Oculus quest controllers and some VR controllers. These devices are sensitive to voltage levels. When the battery voltage drops below 1.1V, the device may determine that the battery is low, resulting in controller disconnection or unstable signal transmission. When using 1.5V Li-ion batteries with a constant voltage output, both overall performance and battery life are improved. While, NIMH doesn’t work in these cases, and alkaline doesn’t last very long at all and becomes expensive, quickly. Their voltages drop rapidly and the device quickly misinterprets it as low battery, leading to shorter battery runtime compared to 1.5V Li-ion batteries.

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【Update】# What you should know about xtar 1.5V Li-ion battery capacity test

Some users asked about how to test xtar 1.5V Li-ion batteries’ capacity. XTAR Lab uses the high-precision battery capacity grading system to test the real capacity of the 1.5V AA/AAA Li-ion batteries. This measurement method is the best and most precise. Set the constant discharge current needed and the cut-off voltage on the grading system, start to discharge, and record the discharge time. Then calculate the battery capacity with the formula : Q=I*T. Here Q means the quantity of electric charge passing through the battery, i.e. capacity. I means discharging current, and T means discharging time. The result is expressed in ampere-hours (Ah) or milliampere-hours (mAh). While, considering most users may not have the equipment. The electronic load and resistor can also be used in capacity test. It needs to set parameters for electronic load to discharge batteries.

To get the accurate testing results, it’s suggested to make triple tests or more and take the average. However, during testing, there are also some factors affecting the test results.

*Ensure a full charge: make sure the batteries are fully charged before testing. It’s recommended to use chargers such as XTAR LC4, LC8, L8, L4 and BC4. These chargers have lower cut-off charging currents, ensuring fully charge on the batteries.

*Proper cut-off voltage setting: To test capacity of xtar 1.5V 4150mWh AA Li-ion batteries, pls set the discharge cut-off voltage to 0.8V or below. These batteries still have some capacity at about 1.1V. Setting the cut-off voltage too high would prematurely stop the discharge, resulting in a lower capacity measurement and inaccurate test results.

*Discharge Current Setting: there is a 3.6V cell within xtar 4150mWh AA Li-ion battery, with a built-in voltage step-down chip to 1.5V output. So there is energy loss. With different discharging current, there is a deviation in the conversion efficiency, it’s recommended to set discharging current of 0.3-0.5A.

*Other Factors: t he capacity of the battery will also be affected by the discharge current deviation, integration deviation, cut-off voltage, battery saturation, and operating room temperature. It is advised to test more than twice and make comparison when you doubt the test result.

XTAR 1.5V AA 4150mWh Battery Test by Admiral134:

XTAR 1.5V AA 3300mWh Battery Test by Tony Albus:

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Thanks, that matches my measurements I did with a constant current load and four-wire measurement.

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【Update】 List of 1.5V AA/AAA Li-ion battery chargers

Dear all, there are seven popular AA/AAA Li-ion battery chargers on the market. You can see the specification comparison in the following table.

More details online:

Chargers for 1.5V AA Lithium-Ion Batteries
Chargers for 1.5V AA Lithium-Ion Batteries1588×1125 129 KB

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Here is a video of a review, real capacity is half of the rated one, (1A load) 40mv ripple

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Excellent video, thank you!

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sorry, but in that video the same mistake is made as I have seen here before …

this Xtar does not reduce the voltage from 1.5V to zero at the end, but first reduces from 1.5V to 1.1V, as a battery warning for the user of a flashlight or as support for battery warning displays in devices …

so if you set the cut off voltage in a capacity measurement to 1.1V, as was done in that video, it lacks some hundred mAh that would still be delivered at 1.1V …

in case of especially this Xtar (“4150”) I formerly estimated that to additional about 400 mAh + …

(but many other 1.5V Li-Ions with a voltage reduction before the end have much less mAh left at 1.1V …)

at 1.5V I formerly estimated the capacity of that Xtar at “nearly 1900 mAh” @ 500mA load, that is comparable with the result in the video of 1850 mAh …

so for a capacity measurement of this Xtar battery you have to set the cut off voltage deep enough to get all of the capacity out til the complete shut off …

Xtar offers 1.5V Li-Ions with and without reduction to 1.1V before the end …

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I hope you have fun here, budgetlampenfan!

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this Xtar does not reduce the voltage from 1.5V to zero at the end, but first reduces from 1.5V to 1.1V

There is no mistake, he DID say that even showed it on the graph.
At 1a load it pushed out 1.1A which is even less than half of rated capacity. I’m afraid to even think what would it be at 2A load, like 450mah? lol

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Hey, racoon, what happened to Mila? you don’t like her no more? or she send you seize and desist letter ? lol

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at 1A load with an - as I explained in this case inappropriate - cut off voltage of 1.1V he measured 1763 mAh … (can be seen on the display of the electronic load device at about 17:00 min of the video …)

at 0.5A load with a - still - inappropriate cut off voltage of 1.1V he measured 1851 mAh …

that is, because he does not understand the mechanism of this battery to deliver additional about 400 mAh at 1.1V after the 1.5V phase :

from the video :

“Because the Xtar batteries essentially output 1.5V until it’s very end, the runtime gage would no longer work und you would run into a situation where one minute the battery appears to be full and the next minute it is totally drained.” (4:08 min)

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You seem to not understand that at 1.1v the cell is mostly useless, I suspect its current output at that voltage will be below any usable level. so those 400ma are not usable, even if they exist on paper.

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It delivers 2 A without problems:

Only useless for devices that don’t work at 1.1 V anymore.

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I’ll provide a testimonial. I’ve had these cells in a motorized door lock since last fall and they still have not hit the 1.1V stage despite daily use. They worked fine during the super cold winter period with sub zero F temperatures. The cells are contained on the side of the lock which is inside the house, but still the whole unit was quite cold.

So they’ve performed exactly how I’d hoped they would in this application. NiMH and alkaline perform very poorly in this particular device.

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In my testing the internal regulator shut current flow off at just under 1.1 volts. If you look at my results with my calibrated MC3000, setting cutoff at 0,8 volts resulted in the MC3000 indicating “no Battery” at the end of the test due to this behavior.

If there is anything left in the cell at that point, you aren’t going to get it out. Setting the cutoff below about 1 volt buys you nothing.

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the guy in the video and you in your first measurement set the cut off voltage to 1.1V …

in the video that resulted in 1850 mAh … you got an average of 1900 mAh …

so the cut off voltage has to be set lower than 1.1V to get the full capacity out …

when you did that, you got around 2300 mAh …

that matches with ~ 1900 mAh at 1.5V + ~ 400 mAh at 1.1V …

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Technically, possibly correct. Practically, not as feasible in the working world.
IMO the functioning purpose of this kind of product IS the 1.5v and at least reasonable current output. When they drop to 1.1v that is a signal that they are out and they are no longer able to do their job at 1.5v. If the device NEEDS 1.5v it is likely no longer working. IF it can function properly at 1.1v you may as well use a good NiMh for more capacity and MUCH cheaper, plus the ‘low voltage signal’ is built into it’s chemistry.

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I’m still waiting to find out how the door lock will behave when the cells hit the 1.1V stage. Ideally it will still work but throw the low battery alarm.

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I am interested as well. I don’t think they will work for long once they get to 1.1 Volts. The 4 I tested just shut down at right about 1 volt. Though it seemed to vary by something under 0.1 volts depending on the specific cell under test.