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Old 2nd December 2010
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Arrow 2010 AA Low Self Discharge Battery Review - "The big one"

2010 AA Low Self Discharge battery review

By Chris Dowling (December 2010)

Welcome to my 2010 review of low self discharge (LSD) AA batteries. I was not planning to do a follow up to my first review but somehow it seemed like a good idea a couple of months ago. The number of different brands tested has more than doubled and you will find a new champion unveiled at the end. I hope you will find it both informative and useful.



Changes since my last review in 2009

The LSD battery market has exploded. We the consumer have suddenly got an amazing choice of brands and capacities. I am amazed at how many brands are now for sale, but I do wonder how many are just rebranded products that all lead back to the big battery manufacturers somehow. Inevitably, as LSD technology matures battery capacity has risen. The largest capacity that I have spotted is a mighty 2500mAh. I only discovered these after I had already invested my money in the 8 new brands that I have added to the test line up this year. Perhaps next year I could add them to see if the claimed capacity is just that, or not. A total of 14 brands tested this time around which is far more than I planned for. I simply got carried away; will I find an excuse to expand the review again in 2011?
My interest in LSD batteries now means that I have more batteries than I need to power my gadgets. Some may say that I getting a little obsessed with the subject but my fascination added to the interest from readers gives me a good excuse!

Introduction

Parts of this review are taken from my 2009 article, the background to which was my rather mixed feelings about rechargeable batteries to that point. I wrote that I have had somewhat of a love/hate relationship with rechargeable batteries as I have found it very frustrating going to use a set which turned out to be flat. Even worse, if a set had fully discharged, even after investing in some expensive battery chargers they would then fail to charge, and be effectively useless. I then discovered that battery technology had moved on and low self discharge batteries had become available, which seemed to be the answer to my problems.

Up to that point, I had no real way of objectively testing rechargeable batteries, but after a failure of one of my Ansmann chargers I did a lot of research to look for a replacement. I bought the very impressive Maha (Powerex) MH-C9000 charger which allows control of charging and discharge rates; most importantly it is able to give the capacity of each battery. It was this purchase that gave me the inspiration and the ability to test batteries that led to me writing a review of LSD AA batteries.

What are Low Self Discharge batteries?

Low Self Discharge batteries (LSD) are a development from standard nickel metal hydride (NiMH) batteries. They are ideal for digital photographers and offer some real advantages. The most significant ones in my view are:

1) They will keep their charge when stored for a long time. Typically, the battery capacity will remain around 90% after six months and 80% after 12 months. Remember, standard NiMH will continuously discharge after charging when not in use. Sanyo now claim their new version of Eneloop will still retain 75% of their charge after 3 years; impressive.

2) LSD batteries have a flatter discharge curve under load which gives longer effective use when compared to a standard NiMH battery (assuming like for like capacity).

3) LSD batteries are supplied from new charged, so you can use them straight away; no delays while charging them.

4) Compared to standard NiMH batteries, the life of a LSD battery is significantly longer. LSD batteries can be recharged (cycled) many more times. You can reasonably expect the life of a LSD battery to be approx 1000 cycles before failure. This compares to approx 600 cycles for a NiMH battery. Sanyo has recently claimed that later versions of their Eneloop battery can have a life of 1500 cycles.

5) LSD will remain cooler than standard NiMH when discharged quickly.

6) LSD are capable of delivering higher current more quickly.

7) LSD battery performance at low temperatures is excellent, better than even regular alkaline batteries. They will be the ideal choice for that polar photo shoot that you have always dreamed of.

However, it is not all good news. LSD batteries do have disadvantages when compared to normal NiMH batteries:

1) The maximum capacity of an AA sized LSD is lower than standard NiMH batteries.

2) Standard NiMH batteries are generally cheaper, but the price of LSD batteries continues to drop as their use becomes more widespread.

3) Standard NiMH batteries are lighter due to the construction of LSD batteries.

Remember, the terminal voltage of rechargeable batteries is lower than standard non rechargeable batteries. Rechargeable batteries will only have a nominal terminal voltage of approx 1.2 volts compared to 1.5 volts for a non rechargeable. This needs to be considered when using rechargeable batteries in devices that are primarily designed for non rechargeable batteries. A good practical example of this is my GPS receiver in which I use LSD batteries: the battery indicator shows less than full power available when I insert a fully charged set of LSD batteries. Manufacturers will sometimes offer a selection in the setup menu of the device that allows the user to select what type of battery is being used to solve this issue.

LSD batteries still remain a relatively new development in the battery market. They started to become available in 2006.

LSD Technical Information

If you are interested in the technology of low self discharge batteries read on, otherwise just skip this section as I will not discuss any test results in it.
I have spent a while surfing the mighty web to try and find out a bit more about the technology that goes to make low self discharge batteries work. I thought this section would be useful just to give an insight into LSD. I could have included a lot of techno jargon but I have tried to keep it more as an overview. If you are keen, then there is an awful lot of in depth information to be discovered on the web.

Construction & Composition

In a nutshell LSD batteries are effectively pretty much the same as the established nickel metal hydride (NiMH) batteries that are so common. The difference is that the chemical construction of LSD batteries uses much purer chemicals and improved constructional techniques that give the result of a very slow discharge rate when the batteries are stored. The greater the amount of impurities in the battery, the greater rate of self discharge. New alloys have been produced especially for LSD batteries that further reduce the rate of self discharge. The composition of an LSD battery results in less chemical activity during storage. It is the amount of chemical activity that determines the amount of self discharge during storage. To be clear, both types discharge when not in use but LSD, as their name suggests do it at a much slower rate.

Storage

The rate of self discharge is also affected by temperature, good news here if you happen to live in the Antarctic. The rate of self discharge is reduced if the batteries are stored at a low temperature. Most manufacturers’ data that I have read quote a percentage of full capacity figures after 6/12 months at a temperature of 20 degrees C (68 F). Storage temperature really does affect battery capacity over time significantly. This may concern those of you who live in hot climates. This does seem to be fairly logical: increased temperature would result in increased internal battery chemical activity. Chemical activity as previously discussed is the reason for a battery self discharging. Manufacturers all claim that after a year’s storage a LSD battery will still have anything from 75-90% of its full charge which is excellent news for us users. Recent improvements have resulted in some very impressive claims over even longer periods as I mentioned earlier. However, I don’t think I will start storing my batteries in the fridge just yet though!

Capacity & Current

The internal resistance of an LSD battery is lower, which contributes to the ability to remain cooler and deliver high current flow quickly. In theory, a battery that has a capacity of 2000 mAh should be capable of delivering a current of 2000mA (2 amps) for a period of 1 hour or 1000mA (1amp) for 2 hours. However, heavy current flow will reduce the effective capacity of the battery to prevent this being achieved. Lower current flow will result in a larger effective capacity before the battery will need to be recharged.
LSD batteries still cannot match the large capacity of NiMH batteries but the the advantage of being useful after long periods of storage really makes a powerful argument for using them. At the time of writing the largest NiMH battery that I could find for sale had claimed capacity of a whopping 3100mAh. That compares to 2500mAh for an LSD battery, a difference of 700mAh or approximately 22%. I am still amazed that for a battery the size of an AA it is possible to hold such large capacities. Certainly if you demand a battery with very high capacity, NiMH batteries have an advantage. But do remember that standard NiMH batteries will get hot when delivering high currents and do not have the ability to give high current quickly. For goodness sake don’t put your high capacity batteries in your pocket with a bunch of keys or coins otherwise you might just start a fire!

Charging

Charging rates are a significant factor that will ultimately decide the life of your batteries. Charging at a high rate will produce some apparent “benefits” as the capacity of the battery will likely be higher. Before you all rush and charge your batteries at a high rate there is a penalty to be paid in the long run as it will shorten the life of the battery. We all like the recharge time to be a short as possible but it is a delicate balance. I could write at length about charging times, rates, temperatures etc but I don’t think it would be of great benefit to this review. The web again is a good resource if you do happen to be interested.

Brands of LSD AA batteries

Last time, I tried to compile a comprehensive list of brands that you can buy at the time of writing. However, I have lost count of all the brands that are currently on the market. It is more appropriate to list more information about the brands tested and give a list of others to give an indication of the range of options that are now available. Please feel free if you spot other brands to let me know. As I said last year, “Even better, buy a set and lend them to me for testing so that we can see just how good they are!!” I will be more than happy to return them after testing.

Brands Tested

A total of 14 different types are tested which should give a good guide to the state of the market. As manufacturers develop their LSD batteries new versions will emerge. I purchased a set of “Vapextech Instant 2300mAh” for this review to see how they compared to the previous 2100mAh version. I also have added latest version of “Varta Ready 2 Go” to the review which offers a 2300mAh capacity against the previous 2100mAh version.
It might appear to be a strange thing to do but I have bought an industrial version of the Uniross Hybrio to see if there is any difference between this and the previously tested type.

(Note – AA capacity data is manufacturer’s claimed figures.)





Other available brands

Accu Evolution
Camlink ready 2 go
Digibuddy LSD
Digimax ready 2 use
Ene super
Enerpro
Enix nx-ready
Fujicell Prolife
JCB Ready Charged Rechargeable
Just Power LSD
Kodak pre-charged
Lloydtron Accu Ready
Maha Imedion (Lagest claimed capacity of 2500mAh)
Microbatt ready to use
Nex Cell EnergyON
Samsung Pleomax
Sony CycleEnergy pre-charged
Tenergy Centura
Turnigy AA LSD
Rayovac pre-charged
Ultra Max Rechargeabe Ready to Use

No doubt there are many more!!

Battery testing

I have not changed the method of testing from my original review. Every brand of battery was tested as a set of four. Each set were subjected to two different tests using the “Refresh & Test” mode offered by the Maha MH-C9000 charger. In this mode the charge and discharge rates are set by the user then the battery is fully charged and rested for one hour before fully discharging the battery. Then the battery is rested again before fully charging the battery again. At the end of the test the charger displays the capacity of each battery.

I chose to test each set of AA batteries twice as I wanted to see if there would be any difference in battery capacity if the batteries were charged and discharged at both low and high rates. Another benefit of testing each set twice was that I hoped that it would validate and highlight any suspicious test results. These tests took a long time to complete as testing just one set at the low rate, for example, took in excess of 10 hours.

One area of battery performance that I have not tested is the self discharge performance of each brand over time. This is a shame really, but I would actually like to use the batteries that I have bought rather than having them all stored for 6 or 12 months. I am just going to have the trust the manufacturer’s figures: this is an obvious weakness of my review.

Test 1 Low rate charge/discharge





Test 2 High rate charge/discharge





Test Notes

Capacity = mAh

Range = Difference between the highest and lowest battery capacity in mA

% = Range as a percentage of the lowest capacity battery tested

Claimed = Manufacturers claimed battery capacity mAh

% Lowest = Lowest capacity battery of tested set as a percentage of the claimed capacity

% Highest = Highest capacity battery of tested set as a percentage of the claimed capacity

% Set = Average capacity of set of 4 batteries as a percentage of the claimed capacity

Test data

Let me first explain the test data

Capacity – Columns 1,2,3,4 are just the capacity of each battery in mAh. For example, if a battery has a capacity of 2000mAh it would in theory be able to supply a load of 500mA for 4 hours or 1000mA for 2 hours.

Range - Ideally, range should be 0 but there will always be a difference between batteries; the lower the number the better.

% - is the range figure as a percentage of the lowest capacity battery tested; again, the lower the percentage the better.

Capacity of manufacturer’s specifications – Just to see if the capacity of the batteries under test actually matched the manufacturer’s claimed figure. The best result would be 100%. Would it not be a nice change if a battery exceeded the manufacturers figure to give a > 100% value?

Best individual battery – The individual battery of the set under test with the highest capacity. To be honest, this in my view is just a nice to know figure and is not really relevant, as a set of 4 batteries will be limited by the worst battery in the set.

Worst individual battery – The individual battery of the set under test with the lowest capacity. This is the result that I was most interested in as the weakest battery of a set will be the one that limits the useful life of a set of batteries.

Conclusions / Final thoughts

And so to the business end of the article. In my last review I did find it reasonably difficult to split the tested batteries in to best, good, average, and poor categories. In fact I went as far as stating that none were poor performers, but how things have changed this time around.

Lets get the “turkey” award, the worst on test out of the way first. This dubious accolade goes to the “7dayshop Good to Go battery”. They managed to get the bottom of the table in virtually every test, the only the thing they had going for them was that they were a relatively well balanced set of poor performers! It is a disappointing that a retailer I use a lot to buy many things gave me no opportunity to write something positive about it.

Not missing out buy much on winning the turkey award are the “Ansmann MaxE” and “Uniross Hybrio Industrial” batteries which are both new to the review. Ansmann’s poor results are a real surprise to me as they are such are a big manufacturer that specialize in the battery market. Ansmann already have a 2500mAh version of the MaxE on the market. However, it will take some persuading before I part with my hard earned cash and buy a set. I only bought the Uniross Industrial Hybrios out of interest to see how they compared to the retail version. I am at a loss to understand why they revealed such poor figures. Please do not let this put you off buying the retail Hybrios, remember they were the winners of the 2009 review which still remain a very attractive proposition despite the market developing significantly.

Honourable mentions must go to the “Varta Ready 2 Go” and “Hahnel Synergy” brands which are tremendous additions to the test line up. The Varta batteries produced some very impressive capacity results but are marked down for me by their high purchase cost. I bought the Hahnel Synergy as I had become aware that many photographers buy Hahnel dedicated batteries to power their cameras. What a well balanced set offering very good capacity against the Hahnel quoted figure; an all round solid performer that are very easy to recommend.

Without doubt, there is a clear winner when all things are considered. Some of you may not be familiar with Vapex Tech as a brand but do not worry. Previously, I had tested the lower capacity version and expressed concern at the large, virtually 9% range the tested set showed. The new 2300mAh version of the Instant battery performed far better at just 3% at worst. The capacity figures the tests revealed are stunning, peaking at 2263mAh in the high rate test, that’s as good as 30% more than the poorest performer. Add this to the very modest cost when bought direct via Ebay of a set of 4 at just 5.55 delivered, you have yourself a bargain. That’s not all either, you will even get a nice plastic storage case as well. Therefore I have no problem giving Vapex Tech a wholehearted plug, superb.

Unlike many things these days, things have got a whole lot better this year for us the end user. This means you will be paying less, taking more pictures, using your flashgun for longer and possibly not even lugging so many batteries around with the impressive performance improvement observed in this test.
That’s all from me, enjoy your photography, until next year?

Cheers

Chris
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  #2  
Old 11th December 2010
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Re: 2010 AA Low Self Discharge Battery Review - "The big one"

WOW!

You're amazing. I'm so glad there are people around who can be so analytical, I wouldn't have even known where to start to try and round up the performance characteristics of all these batteries.

It seems to me that my Eneloops, which I only bought recently seem to not be as powerful as they were made out to be.
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Old 11th December 2010
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Re: 2010 AA Low Self Discharge Battery Review - "The big one"

I bought a set of Hybrios following your 2009 review and they have lived up to my expectation. I shall now splash out on a Christmas present to myself of a set of Vapex Techs
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  #4  
Old 11th December 2010
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Re: 2010 AA Low Self Discharge Battery Review - "The big one"

Wow! Thanks for this
I must admit, I missed the first round, but this is great. I bought some Uniross Hybrio Industrial last year after quite a few recommendations on another forum - they have always seemed to perform well, but I haven't done any direct comparisons.
I was going to be buying some more after Christmas but maybe I'll go for VapexTech instead!
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Old 11th December 2010
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Re: 2010 AA Low Self Discharge Battery Review - "The big one"

Thanks very much for this superb review!

Dave
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Old 12th December 2010
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Re: 2010 AA Low Self Discharge Battery Review - "The big one"

Thanks for the comments, it makes the time spent on the review worthwhile knowing that it has been of value to you.

Cheers

Chris
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Old 28th December 2010
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Thumbs up Re: 2010 AA Low Self Discharge Battery Review - "The big one"

Thanks for an excellent and detailed review.
I have collected a few of these batteries over the years and have done some tests on some old ones and some brand new ones.

I used a battery logic BL-700 charger. Charged at 500, discharged at 250.

I was very surprised to see how well they performed, particularly that most were better than the manufacturer quoted capacity. I even tested 2 of the eneloops for a second time to make sure and got very similar results to the first time around.



I'm not certain if 2 of the uniross ones are LSD (see pic). They say multi use long life on the packet and I purchased them on the understanding that they were of the LSD type, they certainly behave as if they are in the low capacity devices I use them in and the available power after long periods of storage. But the packaging is different to the ones pictured in the OP and mine don't actually mention Hybrio.



I wonder if I have had particularly good batches of batteries or whether my lower charging rate is better for the batteries??

My own feeling is that there isn't a huge difference in the 4 brands I have tested. The current best option in my opinion are the GP reckyo batteries which are available for around 6.75-6.99 for 6 (4 + 2 free) i.e the cheapest per battery of these 4 gets my vote.
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Old 30th December 2010
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Re: 2010 AA Low Self Discharge Battery Review - "The big one"

Dear Socrates,

It is really interesting to read about your findings. I think what we are seeing here is the difference in the calibration of our 2 chargers combined with the different charge and discharge rates. I have a high regard for GP as a brand which is why I wanted to include them in my tests.

It certainly does prove that as for any type of testing it should be ideally done using the same calibrated charging equipment. I am so pleased that you took the time to do your own experiments which give another good source of information.

Cheers

Chris
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Old 31st May 2011
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Re: 2010 AA Low Self Discharge Battery Review - "The big one"

I managed to overlook this when it was originally posted - so I have now pinned it as it's a very useful bit of work!

Ian
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Old 31st May 2011
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Re: 2010 AA Low Self Discharge Battery Review - "The big one"

Clearly a lot of time and effort has gone into this piece of work - Much appreciated,I shall read it with much interest.
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Old 31st May 2011
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Re: 2010 AA Low Self Discharge Battery Review - "The big one"

Awesome work, many thanks for sharing your results.

I've bought Infinium batteries and they work as advertised, I've used them in audio/video remote controls, dymo label printer, helicopter... and I've got the AAA version in my Panasonic landline phone system. However, for flashguns, my preference goes to non LSD batteries such as the 7 day shop 2900 mAh as more power means less wait for the flashgun to be ready.
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Old 5th June 2011
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Re: 2010 AA Low Self Discharge Battery Review - "The big one"

Dear Francois,

I am pleased that you found the article useful, feedback makes all the effort worthwhile.

Cheers

Chris
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Old 9th August 2011
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Re: 2010 AA Low Self Discharge Battery Review - "The big one"

Hi Chris,
Very useful article indeed, many thanks. Could you recommend a battery charger for the Vapex Tech batteries? I have read good things about the Intelligent or Negative Delta Voltage (-dV) Chargers. Would you recommend any of these for the Vapex Tech?
Thanks again
Brian
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Old 8th September 2011
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Re: 2010 AA Low Self Discharge Battery Review - "The big one"

Im trying to find some Vapex Tech batteries but unable to find a site selling them, ive found the Vapex tech site but has anyone else found another site selling them.
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Old 8th September 2011
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Re: 2010 AA Low Self Discharge Battery Review - "The big one"

Quote:
Originally Posted by DCFC734 View Post
Im trying to find some Vapex Tech batteries but unable to find a site selling them, ive found the Vapex tech site but has anyone else found another site selling them.
How about here:

http://stores.ebay.co.uk/Vapextech-B...id=p4340.l2563

Jim
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