Sanyo Eneloop AA NiMH Pre-Charged Rechargeable Batteries - 8 Pack
by SANYO
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Digital Cameras Photo Reviews of Sanyo Eneloop AA NiMH Pre-Charged Rechargeable Batteries - 8 Pack
Customer Review: Everything it claims to be
Summary: 5 Stars
Finally, a NiMH technology that can rival alkaline batteries. A problem with NiMH is that the self discharge rate make it unsuitable for low power uses that you'd still use alkaline's for: e.g. remote controls and flashlights. Because ordinary NiMH will self discharge ~1-3%/day without use, the battery can run down in ~ 1-3 mo even if unused. Eneloops hold a charge over a year, so it can replace most alkaline cell applications. In the old days, I'd wish for cells with more mAH, but as better digital cameras and other AA devices have become more power frugal, being able to charge and store a bunch of eneloops is more convenient that fast charging ordinary NiMH or using them very soon after charging, to maximize their mAH.
Here a quickie on 1 week worth of tests using a Powerex WizardOne aa/aaa NiMH Battery Charger-Analyzer.
New Cells in a box: freshly unwrapped, all 4 cells delivered about 1400mAH.
An IEC 61951-2 charge test showed all 4 cells rated >= 1950mAH, as promised on the battery labels.
At 1A discharge, the cells delivered > 1700mAH. At 500mA, the cells delivered > 1800mAH.
After 1 week of storage, the cells were still ~ 1900mAH, ~ zero loss in 7 days. I had a group of standard NiMH cells charged fresh with the eneloops, and they were down 20% in the same period [these are also older cells]. My standard NiMH mAH would drop much when subject to heavy discharge loads, such as the 1A and 2A.
The eneloops perform just like any NiMH is expected too, but with that marvelous low self discharge rate. Granted 1 week is not 1 year worth of storage, but the difference in self discharge rate between these old NiMH I had, and my over 10 years of use of NiMHs, make the 0%/week discharge rate for the eneloops a good sample of what I can expect over a year.
I am so pleased with this type and brand I've bought 20 over the past month. The initial tests I mentioned for the 1st 4 cells are nearly identical for each batch I received and tested. The quality control of these Japanese made cells is such a revelation, compared to the variety of performance I experience from many brands, major to minor, all Made in China.
Customer Review: I Didn't Believe It But It's True...
Summary: 5 Stars
I've owned or own 2500 and 2000 MaH Energizers, two sets of Sony, and now two sets of these Sanyo Eneloop 8 Pack AA NiMH Pre-Charged Rechargeable Batteries pre-charged batteries. I've owned them for two months, and have been extremely satisfied especially when compared to all other rechargeables bought since my first digital camera and MP3 players back in 2000.
I'm not certain I understand why the pre-charged part of Sanyo's description is so prominent, but it does help ONCE in the use of these batteries. When you first use the first four, and keep four in your camera bag just in case, it is true: after being on the shelf for who knows how long, the second set will have 75% plus charge left when you take them out of their plastic pack. I haven't had them long enough to know whether they'll hold this charge for a year after I've recharged them, but I'm guessing that that wolds true as well.
What I'm still trying to figure out is the difference between Energizers or Sony 2500mAh and these 2000mAh. These certainly last as long on a photo shoot, even using flash.
What I can tell you is this:
1. I was able to take over 800 photos at max resolutions with the first set of four right out of the packaging.
2. They recharged in 90 minutes and, to be honest, I haven't used the spare four yet except to see that they worked. (Unfortunately, my Canon digital camera doesn't have a battery meter until it's too late - got to remember to put that in my review of the camera.)
3. One set of Energizers only lasted a year, and I'm sure I didn't recharge them more than 10 times. One set of Sony's lasted only seven months under the same conditions. In all cases, I'm talking about AAs. The AAAs haven't fared as well.
4. I will be buying more of these Sanyo's and, as soon as I'm done with this review, I'll be looking for the AAAs which I use in two MP3 players and one AM radio.
Hint from years of experience: if you get the pack of 8, mark four with a permanent marker, and use the set as a set. I don't know why, but sometimes when you mix batteries, you'll find one or two with different strengths after the fourth or fifth charge.
Customer Review: Good performance, save money
Summary: 5 Stars
I wouldn't call myself a rechargeable battery specialist but, following the purchase of 2 'robots' for the kids that EACH require 12 AA batteries to operate my options were either go 'rechargeable' or go bankrupt quickly. So, after some research, I went with 2 eneloop Starter Kit in Blue Case (Power Pack) plus this extra AA 8-pack. Now, that we've used them for a while, I can say that I am happy with what we got and we are likely to go 'eneloop' again if we ever need more AA/AAA in the future.
These are 1.2V, 750/800 mAh (AAA) and 1900/2000 mAh (AA) Ni-MH batteries. According to Sanyo, they easily beat the 'regular Ni-MH' competition when it comes to retaining their charge. Also according to Sanyo, the eneloops retain about 90% of their charge after 6 months and 85% after one year. Why is this important when it comes to rechargeable batteries? I don't know. What I do know is that I've been using eneloops for quite a while and I've been a happy user so far. Moreover, if 'authority' can be invoked, my G700 Logitech gaming mouse came with an eneloop battery in it so there must be something good about a brand that both myself and Logitech have been using for a while.
I am very happy with these rechargeables because they are saving me a lot of money and because they appear to be built to last for many hundreds or charges. The other thing I like about the eneloops is their color. I know that it may not seem too relevant but the fact is that we lost MANY rechargeable batteries by throwing them away because we forgot they were rechargeable and we forgot because they looks 'just like' the other batteries. The white eneloops stand out and it is not likely that we will throw them away.
For the so-far flawless battery performance, hard-to-miss color and because they are already saving me money I can say that I do love these batteries and they get my 5-star rating.
Customer Review: Great battery for photographers
Summary: 5 Stars
I purchased a set of 8 about 2 months ago, after becoming thoroughly frustrated with my much more expensive Powerex 2200mah batteries, that I had been using for about 1 year prior.
I use a Canon S2 IS, which goes through batteries like they're going out of style. I had thought the Powerexs would be ideal from what I read in their marketing, but I had some very bad luck with them. Out of the 8 Powerexs, one is now completely dead (as of 4 months ago, will not charge at all), and the remaining ones seem unable to hold a charge at all. Despite my best efforts to "match" them, a set of four will not last me a weekend of shooting (I shoot motorsports racing) without needing to be charged at least 4 times a weekend. Meaning I had to bring a car charger and charge in between races, often missing some races altogether.
Enter the Eneloops - so far, so good. They do seem to hold their charge extremely well, as advertised. I don't run any tests, I simply go by what I see. I charge both sets after finishing up a weekend, and let them sit until the next event. I can pull them out of the case, pop them in my Canon and shoot away, it is not uncommon for me to be able to shoot an entire weekend (2 days of racing) on one set of the Eneloops (although I always bring two sets just in case, that is never a bad idea, hence this 8-pack being such a great deal IMO). The fact that they work so well in such a power-draining application is testament enough for me, I will never go back to Powerex.
The Eneloops charge using my Powerex charger, I think you can use any charger that is made for these NiMh type batteries.
Customer Review: Great batteries
Summary: 5 Stars
I bought several sets of these batteries a year or so ago and have been testing them in our real-world environment in the house where my kids go through batteries almost as fast as they go through shoes. We use the batteries in wireless controllers for video games, digital cameras and other household electronics devices.
I let the kids treat the batteries as disposables (just that they need to bring them back to me when the get new ones from the battery drawer) and they change them as necessary. I take the used batteries, charge them up and put them back in the battery drawer for subsequent use. Keeping some ready-spares makes this entire process work. This also keeps the kids from having to wait to recharge the batteries since they have ready replacements.
This is all enabled by having rechargeable batteries that don't lose their charge while sitting in the drawer and this has worked very well for us.
We haven't measured how long they last, but the general feeling is that they last at least as long as typical alkaline batteries (and in some devices like digital cameras they last much longer).
I've recently bought more of these batteries -- not because we're replacing the old batteries but because I went to lengthen the pool of spare batteries so we can put these into more and more of our devices in/about the house.
Very happy with these batteries and strongly recommend that if you use batteries in your house you switch over to using these type of batteries rather than continuing with traditional batteries (for cost, environmental, *and* convenience reasons).