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Customer Review

108 of 114 people found the following review helpful
2.0 out of 5 stars 2900 MAh?, 20 Sept. 2010
This review is from: 7dayshop AA 2900 Ni-Mh High Performance Rechargeable Batteries - 4 Pack
I bought four sets of these direct from 7DayShop. I buy quite a few things from 7Dayshop and find them to be good value and excellent products, generally.

However these batteries do not seem to be up to par. The good thing is - they come in a nifty little plastic box which is very, very useful for organising your batteries, particularly for my purpose - that of off-camera flash.

However, I put four of them in a Maha Powerex C-9000 charger, in "analyze" mode, at 500 mA charge, and 300 mA discharge, and they were all reported as being around 2000 mAH, which is just over a third less than their stated capacity. Now not everyone has a sophisticated charger - so not everyone will be able to test the capacities of their batteries.

A second set I am currently testing, one of the batteries has already terminated at just over 1000 mAH!

Now - I'm being generous and giving this 2 stars, particularly as even at 2000 mAH these batteries would be good value for money, and I havent tested them all yet, but from this evidence I would say these batteries need to be viewed with caution, particularly if you really need that higher capacity (such as those into radio-control etc.)
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Showing 1-5 of 5 posts in this discussion
Initial post: 23 Jun 2011 11:25:01 BDT
cleudo says:
I think I would have to agree with your comments there - got a stack of these and I'm seeing capacities of between 2100 and 2200 after multiple refresh cycles on my BC700 charger.

Perhaps a trickle charge would get nearer to the stated capacity? But who's got time for that!

Posted on 3 May 2013 13:26:41 BDT
Juxxize says:
hello , i don't know much about battery's but i need some good battery's for my digital camera , i have some good 2500 mah and i always buy that brand ( tronic if anyone is interested ) but tronic don't do above a 2500 mah battery so anyway my question is , is it normal for battery's when tested in a charger like what you guys have to actually rate lower than stated or is it just these battery's ?

In reply to an earlier post on 5 May 2013 20:54:29 BDT
They should appear to be a bit lower at first, and after about 4 or 5 charge cycles, they should be getting something like the rated capacity. Then slowly they will lose capacity over time, but still be good to use.

I think that it is probably physically impossible to get more than 2500 MAh in AA batteries at the moment.

Posted on 5 Aug 2014 12:51:30 BDT
Me says:
I have other non branded batteries stating 2.500 mah and have often thought they seem to run flat too quickly. Should we trust the big brand names..possibly..?

In reply to an earlier post on 8 Sep 2015 11:28:20 BDT
gcmount says:
I don't know what all the fuss is about batteries stating 2900 Mah yet only having 2000 Mah, this is normal, years ago there used to be a caveat on the box/packet stating that rechargeable batteries need at least 6 charge/recharge cycles before they reach their full potential. I can't understand why they have stopped doing this as it would stop all of this confusion.
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