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Customer Review

17 of 18 people found the following review helpful
3.0 out of 5 stars Average, 28 Oct 2010
Verified Purchase(What is this?)
This review is from: EXTREME 2900 mAh AA (LR06) Ni-MH RECHARGEABLE BATTERIES (4 PACK) (Electronics)
I bought these for use in my Apple wireless keyboard. I chose them because of the long battery life implied by the "2900 mAh" in the title.

The batteries work just about acceptably, butthey don't hold their charge - so there's no point in recharging them more than a couple of days before using them - and, fresh from the charger, my Mac shows them as having 67% charge (by way of contrast, another brand of rechargeable - see my other reviews - shows 90% - I've never seen more than this). The keyboard gets through the pair of batteries in about 3 weeks.

So, sorry but these are disappointing.
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Showing 1-1 of 1 posts in this discussion
Initial post: 25 Jun 2011 16:45:21 BDT
Chasmanp says:
The issue with the batteries showing no more than 90% is down to the voltage Ni-MH batteries are 1.2 where as normal alkaline are 1.5 so in general I would expect to see a Ni-MH showing around 80% on voltage alone (the 90% you have been getting is probably allowing for some degree of error in the Mac software). I am sure there are some physics buffs out there that could provide a better explanation.
Personally for low drain devices like keyboards I have found good quality duracells or energizers preferable as thy are better suited to this use however I see the financial benefits of rechargeables especially with the increased mAh times that we are now getting.
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Review Details

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Reviewer

S. Hill "Stevie"
(VINE VOICE)    (TOP 1000 REVIEWER)    (REAL NAME)   

Location: Durham, England

Top Reviewer Ranking: 984