NiZn AA batteries
jchin
Registered Users Posts: 713 Major grins
Have you heard of NiZn (Nickel-Zinc) batteries? These rechargeable AA batteries are suppose to have 1.6V and about 2500mAH. I am wondering if they are any good.
Johnny J. Chin ~ J. Chin Photography
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Comments
http://strobist.blogspot.com/2010/01/new-nizn-batteries-offer-lightning-fast.html
... people are reporting cell voltages up to 1.85v, well above the design voltage for many devices. I would recommend caution.
You also "must" use a special charger for these cells.
It's an interesting technology but I will wait a couple of years to see if people are noticing much premature device failure.
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Yup, the listed voltage is the "nominal" voltage, which is always lower than the voltage you will get from a fully charged battery. A 1.5V battery will measure over 1.6V brand new, and a 1.2V NiCd will measure around 1.35V fully charged.
Also, if you look closely at the pictures (the ones I've seen anyway), they are actually rated at 2500 mWH (That's milli-Watt Hours, not milli-Amp Hours) and 2500 mWH at 1.6V is the same as saying 1560 mAH... But then again, a 1.2V NiCd @ 2000 mAH runs is the same as saying 2400 mWH... so total power (which is what Watts measure) is actually comparable to current batteries.
I have been extremely happy with Eneloop rechargeable batteries. I have not made any scientific tests but, they appear to provide more falshes and quicker recycle time than even top-line alkeline batteries such as Energizer. This is despite the fact that they appear less powerful on paper.
They also appear to have quite a good capacity to hold their charge over an extended period. Again, I have not bothered to make scientific tests but, they appear to hold charges better than other rechageables I have used in the past,
Eneloop price is not bad either. I bought a set of eight AA and two AAA batteries along with recharger, and a set of converters which wil allow the AA batteries to be used as C and D cells, for a bit over $25 USD.