Duracell Rechargeables StayCharged AA Batteries, 4-Count
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Product Reviews of Duracell Rechargeables StayCharged AA Batteries, 4-Count
Product Review: A large improvement.
Summary: 5 Stars
A large improvement over the old NIMH. Testing shows that these type of NIMH will lose their charge more slowly. This makes them more useful because they can be used in long term low draw items like the outdoor thermometer, alarm clock, and things that sit between uses like the pocket GPS and the underwater camera without being dead every time you need them. Yes they are similar to Enloop batteries, so what.
Now the cons- Mine did not arrive fully charged. NIMH batteries do not take a full charge for the first 2 or 3 uses. That is normal. These won't develop their full potential until you charge them and use them once or twice.
They are a definite advance. I won't get the old kind any more. Buy Them.
Product Review: AWESOME
Summary: 5 Stars
If you have a digital camera, WII, remote control, flashlight, or any electronic that uses AA batteries this is the battery for you!! The batteries can easily hold their charge for 5 to 6 months without needed to be recharged before use which is big plus over the old NMHI batteries. Try them and you will definitely love them.Product Review: An eneloop by any other name...
Summary: 4 Stars
[Updated Dec 24, 2008]
I was only half-right when I boldly proclaimed that "Duracell Pre Charged AA are rebranded Sanyo eneloop cells" in my original review. It turns out that the first batch of Duracell AA cells I bought from Amazon are made in Japan, and those are identical to eneloop (both mechanically and electrically). But lately I bought some more Duracell AA from a warehouse club. Those are made in China, and they are identical to the Rayovac Hybrid.
[Original review follows]
Judging from similarity of technical specifications and physical shapes of (+) and (-) terminals, I am convinced that the Duracell Pre Charged AA is actually SANYO eneloop AA underneath a different wrapper. Therefore all the good things you heard about eneloop apply to Duracell 'Pre Charged', too.
My own testing has shown that the capacity of eneloop AA cell is slightly above the claimed 2000mAh, and it is able to retain at least 85% of its charge after 5 months in storage. The Rayovac Hybrid AA starts with slightly higher capacity at 2100mAh, but it 'only' retains 80% capacity after 5 months. For all practical applications, both are equally good. Just pick whichever brand (Sanyo, Rayovac, or Duracell) is on-sale, and you can't go wrong.
One small problem with the Duracell 'Pre Charged' cell is that: it looked too similar to the well-known 'Copper Top' alkaline cell. So there is a good chance that people may mistaken it for a disposable cell. Personally, I prefer the distinctive-looking white case of the eneloop cell.
Product Review: Awesome Batteries
Summary: 5 Stars
These things are quality. I use them mostly for my Xbox 360 / Wii controllers, and I've found that they last longer than fresh alkaline duracells. Definitely a smart buy, since they only cost a few times more than alkalines.
I recommend getting the "smart" charger for these. There's two of them, the smart and the dumb. The dumb just gives anything you put in it 6 hours of juice, regardless of if its low or not. The smart one lets you put in any combo of batteries (AA or AAA) and it gives each one only what it needs. This extends the life of the batteries significantly.
Product Review: Battery Capacity Test
Summary: 4 Stars
My son's school science project this year was to test a set of rechargeable batteries. He conducted two tests on Duracell, Sony, Energizer and Lenmar: 1. Long term storage test where the batteries were fully charged and stored for two weeks before measuring the voltage. 2. Capacity test where randomly selected two batteries were fully charged and put on a regular flashlight until a complete discharge happened. The first test was inconclusive. He repeated the capacity test multiple times and the clear winner was the Energizer NH15BP-4 and the Duracell came in second. BTW, the manufacture's claim on the overall capacity was not even close to the measured capacity.