Rayovac Rechargeable NiMH Batteries, AA-size, 8-count Carded Pack Review

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(More customer reviews)The latest family of Rayovac rechargeable NiMH batteries are all missing one thing: the capacity rating. Previously, you can see the charge capacity (such as '2500mAh') marked on every package and also on each cell. But newer Rayovac rechargeable NiMH cells are just grouped into three classes ('Everyday-Use', 'High-Energy' and 'Hybrid'), with vague claims such as 'Up to 275 photos' printed on their packages.
Of course, those claims make very little sense to us, because Rayovac never tell us which camera was used, and under what test conditions were those photos taken.
After a lot of searching, I was able to find the spec sheet for those cells from rayovacindustrial dot com:
- NM715-4OP 'Everyday-Use' AA, 'Up to 275 photos': capacity=1400mAh
- NM715-4B 'High-Energy' AA, 'Up to 375 photos': capacity=1900mAh
- LD715-4A 'Hybrid' AA, 'Up to 400 photos': capacity=2100mAh
The item offered here is the NM715-8OP (the 'OP' stands for 'Opening Product'). It has the LOWEST capacity amoung all Rayovac NiMH batteries. I have tested some in my La Crosse BC-900 Battery Charger, and the average capacity is actually higher than spec at 1500mAh. But this number is still very low by today's standard for NiMH AA cells. So although the price looks attractive, this is just not a good value.
As of this writing, this 8-pack (NM715-8OP) is actually priced higher than two 4-pack (NM715-4OP). Furthermore, the Rayovac 4.0 AA 4-PACK is available at even lower cost. Those are low-self-discharge cells with higher capacity of 2100mAh. So it is a no-brainer which package you should buy.
[Update on July 16, 2010]
I recently discovered a hidden benefit of those Rayovac 'Opening Product' AA cells: they are exactly the same size as alkaline AA cells, while other NiMH cells with capacity 2000mAh or over are all slightly thicker. So for some appliances with extremely tight battery compartment (such as the Rayovac Sportsman Xtreme 1W LED Flashlight), those are the only rechargeable cells I can use.
[Update Sep 4, 2010]
As if the offerings above is not confusing enough, Rayovac has now discontinued the 'Hybrid' series, and replaced it with another two types:
- LD715-4OP 'Pre-Charged': capacity=1400mAh
- PL715-4 'Platinum Pre-Charged': capacity=2100mAh

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Duracell CEF15NC 15 minute Battery Charger Review

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(More customer reviews)The Duracell 15 Minute Battery Charger has 4 channels (or battery slots) for charging 4 AA / AAA batteries.
Charge Time
-----------
- The battery charger works as advertised; it fully charges NiMH rechargeable batteries in about 15 minutes. Charge times can be longer for batteries that are higher in capacity than the ones that come with the charger (2500 mAH). For example, it sometimes takes up to 20 minutes to charge my 2650 mAH AA Duracell batteries.LED Light
---------
- The LED light can indicate one of three charge status:
1) Off ......... Charge is complete for all channels
2) On ......... Charging is in progress on at least one channel
3) Blinking ... 1 or more batteries are bad
Unlike some battery chargers (such as the Energizer 15 Minute Charger), it doesn' have 4 independent LED lights to indicate charge status for each of the channels. There's, therefore, no way to know WHICH channel has completed its charge and WHICH channel has a bad battery.Bad Battery Woes
----------------
If the Charger detects a bad/damaged battery (indicated by its blinking LED light), it will refuse to charge the battery.
This charger used to frequently reject batteries that I had used only a few times (money down the drain). I had to keep buying new batteries -- and that was very annoying!
At first, I thought maybe this charger was actually ruining my batteries! But I managed to finally catch on to what was happening: my camera was the culprit!
The reason: on many camera's and other high-drain devices, batteries can be over-discharged and can go through a phenomenon known as "polarity reversal." Many devices have a built-in mechanism to detect when batteries reach a "cut-off" voltage (or more properly termed, the end-of-discharge voltage), and shuts down automatically before damage can occur. Many devices, however, do not have such a mechanism.
Now, I'm careful to not over-discharge my rechargeable batteries - I have never had a bad battery in a long time.Conclusion
----------
The Duracell 15 Minute Battery Charger works flawlessly. My only complaint is that it doesn't have 4 independent LED lights to indicate charge status for each of the channels.


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Bower XPB430 AA Rechargeable Battery 3000mah 4 Pack Review

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(More customer reviews)The average capacity of four brand-new cells measured less than 1600 mAh at a 1000 mA (0.3C) discharge rate. This is worse than the Tenergy AA cells, and far worse than typical Energizer or Duracell NiMH batteries. This product is representative of the cheap, low capacity non-namebrand batteries that have been flooding the market.

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Rayovac Rechargeable NiMH Batteries, D Size, 2-Count Packages (Pack of 3) Review

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(More customer reviews)Don't let the hefty size of these Rayovac Rechargeable NiMH Batteries fool you. Each one of the so-called 'D-cell' is simply an AA-cell wrapped inside a larger plastic shell. The capacity is only 2200mAh, which is typical for a NiMH AA cell. So when you use those rechargeable D-cells in your appliances, expect to get only one-quarter of the run time compared to when using alkaline D-cells.
On the positive side, the weight of this rechargeable D-cell (around 2 oz. each) is much less than that of an alkaline D-cell (5 oz). More importantly, using rechargeable batteries instead of disposable will save you money in the long run. So they are still worth considering - as long as you are willing to recharge them frequently.
If longer run time is important, you should look for real D-size rechargeable batteries with much greater capacity, such as the CTA D Size 12000 mAh NiMH. Unfortunately, they are also a lot more expensive than those Rayovac D-cells.
Don't forget you also need a charger that can accept D-cells. The model I recommend is the Rayovac Universal Battery Charger, which can recharge AA/AAA/C/D and 9V batteries. Another valid approach is to get the Sanyo Eneloop Power Pack, which includes 8 AA cells and 4 each of C- and D-shell adapters. That way, you can use the same AA rechargeable cells in appliances that require larger batteries.


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PowerUP Battery Charger for AA & AAA Batteries with (4) High Capacity AA truCELL 2700 series Rechargable Ni-MH batteries Review

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(More customer reviews)The four AA rechargeables alone are worth the price. The charger is primitive--no automatic shutoff, no on/off switch, no labeling telling you which slots to use if you are charging only two batteries--but it works.
It took me a few minutes to realize that there was a plastic film that needed to be removed from the contacts on the charger before it would work.

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Duracell 67487 - AAA Cell NiMH Rechargeable Battery 4 Pack (DC2400B4N) Review

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(More customer reviews)OK. So notice most of the complaints are about the shipping time not the quality of the product.
Ordered 3/26 received in two days with prime.
As others have mentioned these are 900mAh batteries.
Ran the 4 cells through a few charge-discharge cycles on a BC-900 charger (also a good product available here). All of the batteries tested above 900mAh. 902, 926, 928, and 937mAh. This is with only a few cycles on them so it might creep up later but should not be much.
This is better performance than less expensive brands (ultralast, etc.) Those seem to test at only about 50% of the cells above the stated capacity, although they are often at least 85% of listed capacity.
Just my experience, with a small sample size. Choose which is best for you.
Would be 5 stars but could be a bit less expensive. Only a minor complaint.
Update 8/2/06
Used these in a GPS unit and MP3 Player mainly. Probably have been recharged around 10x each. Retested now they are at 900, 924, 930, and 932. so not much change


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Duracell Mobile Charger With 2AA And 2AAA Pre Charged Rechargeable Nimh Batteries, CEF23DX4N Review

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(More customer reviews)The Duracell Mobile Charger (CEF23) is an extremely versatile charger. It actually has two operating modes, as selected by the MODE button:
1. As an AA/AAA NiMH battery charger, or
2. As an USB charger for USB-powered devices.
In battery-charger mode, the unit is a smart charger that accepts 1-4 AA/AAA cells in any combinations. The charger can be powered by either 100-240V universal AC input, or 12V DC input. This means you can also operate it from your vehicle's cigarette lighter adapter. Note that the car adapter is included in the CEF23DX4N, but not in the CEF23DX2.
The charging current is 550mA for each AA/AAA cell. So it takes about 4 hours to full charge up the included 2000mAh low-self-discharge cells (which are the Duracell-equivalent of Sanyo eneloop). I consider this a good compromise between shorter charging time and longer battery lifespan. Once charging is done, the current is reduced to 25mA (actually 0-50mA pulsed at 50% duty cycle) in trickle charge mode.
One really nice feature of this charger is that it has four individual battery status indicator lights. The status light for each cell turns RED when charging, GREEN when the cell is fully charged. It will even blink if you accidentally inserted an alkaline cell.
In USB charger mode, the unit generates a regulated 5-volt supply at its USB socket. You can then connect an USB-powered device (such as IPOD charger) to this unit. Input power for this USB charger can be from one of the following sources:
1. From 100-240V universal AC input,
2. From 12V DC input (car adapter), or
3. From four AA/AAA NiMH cells in the battery compartment.
The third way is the most interesting, because in case of emergency, you can even use 4 alkaline cells to power this USB charger, in order to charge up your cell phone's battery.
I must say that this charger is really well designed. It is a great bargain even if all you need is a simple battery charger. The USB charger mode is just an extra bonus.
[Update on Oct 7, 2010]:
Duracell has discontinued the excellent CEF23 charger (at least in the US) last year. So prices for the remaining inventory have skyrocketed. The replacement product (Duracell Go Mobile Charger) only charges in pairs, and does not contain an USB charger.
- If you just need an inexpensive 2-cell charger that can handle individual cell, consider the Sanyo eneloop MDR02.
- If you need a good 4-cell charger that can operate from 12V cigarette lighter adapter, consider the Targus LCD2700 with LCD Display
- If you need an advanced charger that can operate from 12V CLA, consider the La Crosse Technology BC500
- If you need a good 4-cell charger that can operate from 12V CLA _and_ can power an USB port using internal batteries... Sorry! Your best hope is to look for an international version of CEF23.
[Update on Dec 1, 2010]
Just in case anyone is still interested in this charger: I recently found out that its USB port is capable of supplying 1000mA output current - even though the spec says 500mA only. I discovered this by accident when using it as a portable recharger for my Archos 5 500 GB Internet Tablet.

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24 pcs Tenergy AAA 1000mAh High Capacity NiMH Rechargeable Batteries with 6 FREE Holders Review

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(More customer reviews)Product claims 1000ma/hr. Refreshing & testing with a La Cross tester/charger, proved them to be in the neighborhood of 750ma/hr. Still with most "big brand name rechargeables claiming 800ma/hr and costing twice as much or more - not a bad deal. Assuming these units hold up over time I'd rate them OKAY to buy. I'd also note that on the first recharge/test they mostly came up with less than 500ma/hr, but came up to their higher ratings on subsequent recharges.
I really liked the added cases

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Sanyo HR4UTG2BP Eneloop 800 Mah AAA Precharged Rechargeable Battery Bundle of 12 Review

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(More customer reviews)Ordered both AA & AAA sizes. Batteries work as advertised so far. Since they can be recharged 1500 times it will be awhile for a final verdict. Seller sent the latest version (1500 vs. 1000 recharges) at no additional cost.

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8-Pack Long-Lasting 2200mAh HYBRID AA Ni-MH Rechargeable Batteries w/ Latest Hybrid Technology Review

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(More customer reviews)These were great for the first six months, but then started to degrade significantly after that. I use the top-of-line slow recharger from MAHA, and even with attempts to revive them two of four wouldn't hold a charge and my camera wouldn't even turn on with the batteries fresh from the charger.
The weight of these batteries gives you some sense that these could be subpar made - when I compare the weight of these batteries in-hand with those from another manufacturer I noticed these have half the weight of other AAs. I recommend the Green hybrid series from Sony or regular NiMH batteries from from Panasonic or Sony (orange series) that have

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Sanyo Eneloop NiMH Rechargable Battery Charger MC-MQN06U Review

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(More customer reviews)Good charger, lightweight and easy to store as you can fold the prongs out of sight; but there is a better charger from the same company. This is the MQN06, if you can find the MQN05 model which is very rare (usually just comes with an Eneloop power pack kit package), that is the model to get.
The MQNO5 charges each battery individually.
The MQNO6 charges in pairs. That means you cannot charge 1 or 3 batteries only. If you put 3 batteries, it will only charge 2 of them. If you put 1 battery, it will not start the charging process at all.
How can you identify the MQN05 from the MQNO6?
The MQNO6 has 2 LED lights at the bottom.
The MQNO5 has 1 LED light at the bottom.

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4 pieces of 9V 250mAh NiMH high capacity rechargeable Battery Review

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(More customer reviews)The performance of these batteries has been surprisingly good! I've been using them for almost one year now. I use them in a set of Shure wireless mics (see my review of the mics on Amazon.com). They have been doing an outstanding and demanding job. Their capacity is very good. Additionally, I feel environmentally green by using rechargeable battery. They pay for themselves after few recharges easy. I've been very happy with this product. Highly recommended.

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TruCELL AA NiMH 2900 Series Rechargeable Batteries - 4-Pack **Includes Mouse Pad** Review

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(More customer reviews)I decided to purchase new rechargeable batteries for my Digital Camera because my old ones were giving me less than 50 pictures before they needed to be recharged. I purchased these batteries and am taking around 150 pictures per charge. Now I don't have to worry about my camera going dead or carrying a ton of extra batteries. These work so well and I am so impressed that I will be purchasing a lot more of these for use around the house. It is much more economical and convenient.

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IMEDION AA 2400mAh NiMH Rechargeable Batteries w/Holder- 4 Batteries Per Pack Review

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(More customer reviews)As I googled the Internet and Forums, I found mixed result, some people claims Eneloop performs better, and some claims otherwise. Therefore I decided to do an experiment on both of these batteries to find out which one is a BETTER PERFORMER and better for investment.
Objective: To find out the better performer battery
Items:
1. Four pieces of Sanyo Eneloop AA 2000mAh NiMH Battery
2. Four pieces of PowerEx Imedion AA 2100mAh NiMH Battery
3. Nikon Speedlight SB-800
4. Remote Flash Trigger
5. Process recording device (Sony DSC-P10)
Methodology:
1. Fully Charge the battery
2. Insert battery into Nikon Speedlight SB800
3. Nikon Speedlight SB-800 set to M 1/4 -oEV
4. Fire the Speedlight as soon as it is ready (when the red light is on)
5. Repeat step #3 until the battery is completely depleted
6. Record the following:
a. X number of shots per minute after X number of shots
b. Total shots per charge
7. Repeat the process with next set of battery
To ensure both battery both are in identical optimal condition, I bought both new set of Eneloop and Imedion. Both sets are new and fully charged for 8 hours as recommended by manufacturer for initial use with the same PowerEx MH-C204W Travel Charger before begin the test.
Please refer to the graph my site.
I started off with Eneloop with a recorded blazing fast 60 round per minute (rpm). It drops to 53rpm after the first 100 shots, and then it drops further to 52rpm after 200 shots. It stabilized at average of 45rpm from 300 shots to 1300 shots. It drops to 39rpm at 1400 shots and drops further to 37rpm after 1500 shots. Finally it drops sharply but still managed to squeeze a total recorded 1564 shots. Pretty impressive for first round.
I followed by Imedion immediately. At the initial minute it has a noticeable lower refresh rate compared with Eneloop and I recorded a 51rpm for the first minute, lower than Eneloop 9rpm. It then dropped 20% performance to 42rpm after the first 100 shots. After 200 shots, it stabilized at average of 39rpm from 200 shots to 1200 shots (compared to 45rpm Eneloop). It drops slightly to 36rpm after 1300 shots to 1500 shots. Then it drops further down to 17rpm after 1600 shots. Finally it is completely depleted at 1660 shots.
Conclusion:
Eneloop completed at 1564 shoots and Imedion completed at 1660, approximately 100 shots more than Eneloop, which is pretty much expected as it is a 2100mAh vs 2000mAh, with approximately 5% extra power. For a fair comparison, I only benchmark up to 1500 shots, which is already beyond what average number of photos a person can take on a whole day event (with speedlight)
On cycle performance point of view, Eneloop out performed Imedion from 4rpm to 14rpm with an amazing everage of 6rpm on a consistant performance.
In this experiment, I concluded that the Sanyo Eneloop is a better performer than PowerEx Imedion, at least in speedlight point of view.
Full review, graph, experiment results are available in my blog at: http://www.calvinstudio.net/?p=472


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Tenergy Premium NiMH AAA 1000mAh High Capacity Rechargeable Battery Review

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(More customer reviews)Always quality batteries at great prices. I use only their products in my radiio control planes cause if you loose power in the air you just lost a plane and that would be tragic just because you skimped on a battery.

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SANYO Eneloop 4 Pack AA NiMH Pre-Charged Rechargeable Batteries Review

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(More customer reviews)Excellent rechargable batteries. These are NIMH batteries, so from what they say, you can 'top them off' without doing too much damage to the overall capacity. They also claim to have a significantly less drop off in overall capacity over time.
For things that don't require frequent charging, like TV remotes, I use regular Akaline batteries.
I use these to power the infrared sensor, kitchen garbage can, that opens automatically. The garbage can needs size D batteries. But ENELOOP makes D size adaptors that you just slide these "AA" into. It's great. So for quite a few months now, these 4 little "AA" batteries have been doing the work of 4 "D" batteries. If you buy these, BUY the adatpers that ENELOOP makes, they come in "C" and "D". You'll never buy "C" and "D" batteries again!!


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Moixa MXAA02 USBCell AA Rechargeable USB Cell Batteries 4 Pack Kit Review

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(More customer reviews)This product (Moixa MXAA02 USBCell) is based on a great idea - the kind of idea that makes you smack your forehead and exclaim "Why didn't *I* think of that!" Basically you take a '3/4 AA' NiMH cell, and attach an USB-powered charger on top of it. Now you've got a rechargeable AA battery that can be charged from any USB port. So you'll never be caught without a battery charger - as long as there is a computer nearby.
Great idea aside, there are practical limitations for this USBCELL:
- It is very expensive (about 4 times the cost of a typical AA NiMH cell).
- Its capacity is only 1300mAh (compared to 2000-2700mAh for a typical AA NiMH cell).
- Its charging time is relatively long (5 hours to charge to 90%)
The product description claims that you can also recharge the USBCELL in an "approved NiMH charger" at 250mA for 7 Hours. But make sure that the charger is a 'smart' one. A timer-based 'dumb' charger will badly overcharge the USBCELL, because it treats all cells as having a typical capacity of 2500mAh.
It is true that you don't need to buy a separate charger for the USBCELL. But the economy of scale is stacked against it in any demanding appliances such as digital camera. For the price of just two USBCELL, you can buy a good charger+battery package (such as the Sanyo USB Charger or Sanyo Travel Charger). This way, you get much greater battery capacity and shorter charging time. For anything that requires more than two AA cells, the USBCELL solution becomes even less cost-effective.
It is also true that using USBCELL instead of disposable alkaline cells can reduce your 'carbon footprint' on this planet. But the same can be said for any rechargeable batteries. Compared to a typical AA NiMH cell, the USBCELL requires more energy to produce, and has a shorter lifespan (lower capacity means it has to be recharged more often). Therefore it generates more waste in the end.
Of course, for certain niche applications (such as wireless mouse) the USBCELL is still a good option. At least it looks cool, and makes a great conversation piece.

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