BEST RECHARGEABLE BATTERIES
A list of eneloop test results with extra explanation and/or critique.
ENELOOP vs ALKALINE BATTERIES
Please have a look to understand the difference between basic Eneloop batteries vs Alkaline batteries. Alkaline batteries have a large capacity at very low current. Whenever the device pulls more current the Alkaline batteries supply much less energy than eneloops. Take a look at the following comparison between a Fujitsu High Power AA and one of the best rechargeable batteries, the standard AA Eneloop 4th generation.
- Compare mAh at 0,1A:
This is a low current. Clocks will use an even smaller current.
An Alkaline Fujitsu battery has a capacity of 2258mAh, while an eneloop can provide 1859mAh according to HKJ`s tests. So the Alkaline can run longer on very low currents.
- Compare mAh at 1A:
With devices that pull more current the eneloop batteries really show their strength.
The Fujitsu AA Alkaline can only provide 564mAh at this current while the eneloop still shows 1785 mAh.
- Compare mAh at 3A:
Fujitsu Alkaline now gives about 426mAh while the eneloop gives 1736mAh.
Alkaline batteries can have an advantage in very low current devices like clocks and remote controls. But at the same time come with a very big disadvantage that they can leak and destroy almost any device.
HKJ is a member on forums like Candlepowerforums and Budgetlightforums and has done over 1000 tests on batteries, chargers, flashlights and other electronics. He is a very reliable source for reviews and comparisons.
He uses a bench power supply that can be controlled by a computer to mainstream battery tests. With that he can both adjust Voltage and Current easily. To read more about his tests setup, take a look at his website I will be linking to in the next few tests. Please note that eneloop batteries have the highest capacity after about 3-5 charges.
There are always slight different readings as well depending on the ambient temperature etc.
As you can see, that eneloop batteries can handle a much higher current than Alkalines. You can notice the slight decrease in capacity when the current increases. But even at 3A or 5A they still prove a strong contender. So the best rechargeable batteries can't be beaten by Alkalines at higher current.
AA STANDARD MODEL CAPACITY TEST
Eneloop standard 3rd generation:
Take a look at the table and look for the Measured Capacity.
0,5A it has a capacity of about 1850 mAh.
2A it still has a capacity of 1790 mAh.
And at 5A still 1718 mAh. Go to the complete review here.
Eneloop standard 4th generation:
Again, look at the numbers behind Measured Capacity for the mAh.
0.5A a capacity of about 1883 mAh.
2A it has a capacity of 1826 mAh.
And at 5A= 1766 mAh, so even at 5A they hold up really really well! For the complete test by HKJ see here.
Eneloop std. 4th gen (2016 model):
See the Measured Capacity in mAh..
0,5A it has a capacity of about 1809 mAh.
At 2A it still has a capacity of 1760 mAh.
Not tested at 5A this time. Go to the complete review by HKJ here.
ENELOOP BATTERY DISCHARGE CURVE (QUALITY)
TRACKING OF CELLS (with a Voltage curve)
Eneloops are not only powerful high quality cells, they are consistent from cell to cell. Capacity wise and performance wise. This means that all batteries have the same power and performance without much variety/inconsistency.
You can see the lines in the graphs being always very close to each other. They are very Consistent!
Cheaper cells may have bigger capacity at SOME discharge current, but many times Fail to have identical performance, are less reliable or can`t handle higher discharge currents.
Look at this example of an eneloop AA test by HKJ. You can see both batteries are on the same line. They have the same performance.
If you then compare this with a GP AA test for example, which is also a pretty good battery, you can see the 2 lines (which indicate 2 batteries) still track well, but not as close.
And the following are some cheaper rechargeable batteries which even have a higher fluctuation.
You can see that the difference in performance between 2 cells when you look at the colored lines. So it is not only about max capacity it is about Consistent Performance!
REAL CAPACITY vs CLAIMED CAPACITY
Look at the following graph of a 2500mAh battery. Which by some people should have more capacity than a 1900mAh eneloop cell. Well, take a look and judge by yourself. Sanyo and Panasonic do real tests with real test results according to IEC and JIS standards, they don`t lie. But many companies lie about real capacity. These BTA are one of the worst batteries you can buy. They might have better quality cells at some point, but I stay away from them because of these business practices.
BATTERY CYCLE TEST 1: 1st gen AA vs 4th gen AA accelerated cycle testing.
Mark (also known as PowerMeUp on CPF and BLF) has done some very serious and interesting cycle testing with his Ultrasmartcharger he has built.
HOW MANY CYCLES?
The next graph will show an accelerated cycle testing done by him, and he explains this is not the way the cycle testing is done according to IEC or JIS standards in a laboratory conditions, but a accelerated version with higher current for both charging and discharging. But very informative!
Also, the 1st generation cells will be quite a bit older than the 4th generation cells. See his own explanation and testing here.
CYCLE TEST: Japanese vs Chinese eneloops.
JAPANESE vs CHINESE (Eneloop AA standard)
The next test is a comparison between standard model batteries made in China and in Japan.
Also, this is an accelerated test. See his own explanation and testing here.
JAPANESE vs CHINESE (Eneloop AA Lite)
The next comparison is between the eneloop lite cells. The ones that are Made in China claim a total of 5000 cycles, while the Japanese eneloop claim a 3000 cycle life.
The test below is from AAcycler who has done a lot of cycle tests. He uses his own criteria of testing, and not IEC standards. With his testing he comes to a maximum of 2285 cycles till 64% for the Japanese cells, and max 675 cycles for the Chinese cells.
CYCLE TEST: Partial cycle testing. Result: 5000+ cycles
For a very informative point of view he also tested eneloop batteries without charging and discharging them completely. As you can see in the next graph, the batteries have passed 5000 partial cycles! This will show that charge and discharge eneloops completely will reduce cycle life.
See his own explanation and testing here.
DIGITAL CAMERA FLASH TEST (SPEEDLITE)
About 8 years ago Sys (a member of the Photography-on-the-net forum) completed a comparison between different rechargeable AA batteries. He used digital SLR camera flashes to check the amount of pops a set of batteries could do.
In his latest test, that he started around January or February of 2017, he included the recycle time a Flash needed between the pops. He compared Amazon Basics, Duracell, EBL, Eneloops and Powerex batteries.
There are 3 tests:
1. for the amount of pops 2 sets of the same batteries could do in 2 different Flash units and take an average of both. And compare the 2 to see which batteries could deliver the most pops. Even the 2 flash units amongst each other had a wide difference of total pops.
2.for the recycle time between the pops. After a flash pops the flash needs to recycle in order to do the next pop. The time it takes to recycle is different amongst all batteries.
3.for the LSD rating to see how much % a set of batteries would lose charge every month. He uses a ZTS Pulse Load Multi-Battery Tester. This test is expected to end in 2018.
Keep in mind that using a battery tester is only good for averaging.
See his full story and testing here.
Test 1: Total amount of pops per set of batteries (average between 2 flash units):
Powerex 2700 Pro:Average: 400.5
Eneloop 2450 Pro: Average: 386.5
Powerex 2600: Average: 380.5
Powerex 2700: Average: 371.5
Amazon Basics 2400Average: 359.5
EBL 2800: Average: 331.5 7
Duracell 2450: Average: 297.5
Eneloop White 1900:Average: 294.5
Test 2: Recycle time between the pops:
Each brand was tested at the 5th, 100th, 200th, 300th and 400th pop. To keep it a little short I will include the 5th, 300th and 400th cycle results. See the link for the complete results.
(Sys: "Only those batteries that had 400 + flash pops from YN600EX-RT Flash “B” are ranked; no batteries had 400 + flash pops from Flash “A”")
The 5th Pop recycle time in seconds: (faster is better).
- Powerex 2700 mAh Pro @ 1.48 sec
- Amazon Basics 2400 mAh @ 1.58 sec
- Eneloop 2450 mAh Pro @ 1.64 sec
- Eneloop White 1900 mAh @ 1.68 sec
- Powerex 2700 mAh @ 1.70 sec
- Duracell 2450 mAh @ 1.78 sec
- EBL 2800 mAh @ 1.81 sec
- Powerex 2600 mah @ 1.84 sec
The 300th Pop recycle time in seconds (faster is better)
- Eneloop 2450 mAh Pro @ 2.5 sec
- Powerex 2700 mAh Pro @ 2.7 sec
- Powerex 2600 mAh @ 2.9 sec
- Amazon Basics 2400 mAh @ 3.5 sec
- Eneloop White 1900 mAh @ 3.6 sec
- EBL 2800 mAh @ 4.2 sec
- Powerex 2700 mAh @ 5.8 sec
- Duracell 2450 mAh @ 10.2 sec
The 400th pop recycle time in seconds (faster is better)
- Eneloop 2450 mAh Pro @ 3.2 sec
- Powerex 2700 mAh Pro @ 3.6 sec
- Powerex 2600 mAh @ 4.7 sec
- Powerex 2700 mAh @ 6.2 sec
Test 3: Low Self Discharge test
Take this test with a grain of salt. These are rounded numbers and should not be taken as "real"numbers.
10 YEAR SELF DISCHARGE TEST
Here we have the true LSD King of NiMH batteries. The LSD discharge test was performed by Grant, from getpreparedstuff.com with a UltrasmartCharger.
The cells were new in package, and dated July 2007 which make them just over 10 years old. The result is a discharge capacity 1147mAh at a discharge current of 400mA, which is an amazing 60%. And likely only lost 10% in 10years. This almost looks unbelievable.
MY 10 YEAR OLD ENELOOP DISCHARGE TEST
This test was done on some 10-year old Eneloop batteries I bought in Japan in Summer of 2017. I had seen them in that shop back in 2014 or 2015, before I moved out of Japan. On holidays, in 2017 I visited the same store and they were still there..LOL. I guess because they were TOO expensive. They were about $9 (USD) for only 2 batteries. Nobody in his right mind would buy those... except me.
SKYRC battery charger with 0.5Amps discharge current. And cut voltage of 0.9V. I ruined the test because I was playing with the bluetooth App when I accidentally turned off the program, so I added the second battery as well. Both had about 1300mAh left. That is roughly 60% of the full capacity. The question arises whether these batteries were charged to 70% or 100%. One Panasonic employee told that the batteries sold in Japan are charged to 100% and the ones that need to be shipped overseas to 70%. But that doesnt make sense if you compare these 2 discharge tests between getpreparedstuff and mine. Because they are almost identical results.. and his are likely bought overseas.. just another question I need to get cleared up....soon
The day after the discharge test I did a refresh cycle to bring them back to their max capacity. See pictures below for details.
The first pictures showing the details of the 10-year discharge, and then the data of the refresh cycle. Keep in mind that battery 1 was cut off from the first discharge, so you should add about 70mAh on top of it.
RANDOM TESTS ON THE INTERNET
There are many tests done in the past 10 years with rechargeable batteries. Some of them are pretty good with a one-to-one conclusion like the capacity tests done by HKJ.
But there are some other websites that tested batteries and come out with distorted results and advice.
For example this test: theWirecutter.com
Without even talking about the overly populated Affiliate links here are some conclusions.
My 2 cents:
They are merely looking at a Price vs Performance difference for the first few cycles. This is okay for the first 10 cycles maybe, but they didn`t test long time usage. They jump to the conclusion that X cell is better than X cell cost-wise. This in my opinion is critical. If you want a real comparison for price vs performance you have to test it over the long run. You are not going to use your rechargeable batteries only 5 times in your life!