I bought these batteries 2x8pack in early December 2008. The batteries
are listed on Amazon as having 2300mah capacity, but the one they
shipped were actually 2650mah. (That was the good news).
It was surprised that the batteries did not seem to hold charge for more than a few days... To be sure about this, I bought a La Crosse BC-900 charger and tested the batteries.
I refreshed and charged the batteries in many different ways. The number of cycles and the speed by which the batteries were charged/discharged did not seem to influence the measured capacity.
The BC-900 told me two things.
1) The true capacity is somewhat below the 2650 that is listed on the batteries. All were measured to be in the 2350-2570mah range.
2) The batteries loose their charge very quickly. Judging from betteries I had charge a week earlier, the batteries had lost about 50% in a week.
My conclusion is that these batteries are only valuable if you are using them in power intensive devices - devices that will use up the full capacity within days of them being charged.
It will be waste of your time to charge and store them for more than a week before use... These should be recharged right before use.
Called Duracell about the problem... and they were sufficiently helpful for me to add a second star to my rating.
It was surprised that the batteries did not seem to hold charge for more than a few days... To be sure about this, I bought a La Crosse BC-900 charger and tested the batteries.
I refreshed and charged the batteries in many different ways. The number of cycles and the speed by which the batteries were charged/discharged did not seem to influence the measured capacity.
The BC-900 told me two things.
1) The true capacity is somewhat below the 2650 that is listed on the batteries. All were measured to be in the 2350-2570mah range.
2) The batteries loose their charge very quickly. Judging from betteries I had charge a week earlier, the batteries had lost about 50% in a week.
My conclusion is that these batteries are only valuable if you are using them in power intensive devices - devices that will use up the full capacity within days of them being charged.
It will be waste of your time to charge and store them for more than a week before use... These should be recharged right before use.
Called Duracell about the problem... and they were sufficiently helpful for me to add a second star to my rating.
To recall, here is the color scheme for Duracell AA/AAA batteries:
- Duracell alkaline cell has the famous 'copper top' and a black bottom
- Traditional cell has a 'copper top' and a green/black bottom
The latest batch of rechargeable AA/AAA NiMH cells from Duracell all have the 'copper top' and green/black bottom, similar to that for 'Pre Charged' version. However, those cells don't say 'Pre Charged' on them. Instead, they have their capacity printed (2650mAh for , 1000mAh for . It is important to know that: those are NOT the low-self-discharge type lik They are traditional NiMH cells, which have higher capacity but suffer from rapid self-discharge problem. So even though their prices may look attractive, those are no bargains.Read other reviews saying the batteries don't hold a charge. Used 5 other brands and never had a problem so thought I'd take a chance. Maybe it was a degree of expectations. Under any expectation, these batteries DO NOT HOLD A CHARGE. Great price, but not when they're worthless.It is the second time that i receive batteries from Amazon and the package is open. Can`t really say if the batteries have been used before. I disregarded it the first time, but it is getting frustrating...
If it wasn`t for that, all is was good- excellent shipping speed and amazon packaging. I'm using these as replacement batteries for power sources in wireless phones around the house. The original batteries lasted almost five years, so we'll see how well the replacements do. I had bought 3 packages of 4 (12 batteries) because I still have one old set of Duracell 2600"s which were good. These 2450's are consistently horrible, Within two weeks of a full charge and no use the batteries they measure in the red on a battery tester and they will not power my camera. My off brand batteries which I have had for 3 years are much better performers.I am very disappointed in Duracell for putting out such an inferior product. I tried different uses and a different chargers, but finally reached the sad conclusion: the self-discharge rate on these units is horrific. Do not waste your money on Duracell rechargeable batteries.fast shipping and the batteries hold a charge very well even if left idle for a month at a time,
Perfect for high drain items such as cameras and flash lights
High 2450mah capacity for long use
LKP This product shouldn't be sold at all and I'm surprised a reputable place like Amazon would sell these. Apparently there's a big difference on Duracell rechargeable batteries. Those that say "Pre-Charged" on them versus those that don't. The former are good and last long while the latter are based on old technology and lose there recharging capacity rather quickly. Also, when I ordered I checked that I was ordering batteries with 2650mAh and I received 2450 mAh batteries.
Amazon was great (as usual) about me returning them even after I'd opened one of the packages. Still, it was inconvenient as I needed those batteries for my flashes for a photography event the weekend I received them. I hope Amazon does more quality checks on things like this. I feel Duracell is intentionally trying to dump poor quality stuff on even informed consumers when they package very different items very similarly. I can not speak for other reviewers, in contrary to the other reviewers, the batteries I got can hold their charges at more than 80% level one month after the charge (These is no 100% marking on the battery tester). I uses a to test the batteries. This tester is so far very accurate. Also, these batteries have green tops and they are made in Japan which is clearly marked on the battery itself. The package is almost the same as shown in the picture EXCEPT that they are 2450mah, NOT 2650mah shown on the picture. I used the eneloop batteries for my camera flash before switching to these batteries. Comparing these batteries to the eneloop batteries, these batteries give much more powerful lighting on my Nikon SB-800 flash. The difference is definitely noticeable. Unfortunately, eneloop does not make 2450mah batteries because I love eneloop batteries for their long charge holding ability as well.
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