4-pack AA NiMH Batteries Review

Average Reviews:

(More customer reviews)These batteries are incredibly bad.I bought them for my Nikon Sb-800 speedlight.Since they are 2900 mAh, I thought I was going to get outstanding results.I did not.

I've used Impact 2900 mAh, Enegizer 2500 mAh, and several other 2700 mAh AA batteries.Results were fine.But thses Power 2000 batteries died almost immediately.I couldn't believe it was the batteries because it was so quick.I thought my SB-800 went bad.But, I replaced the batteries and sure enough, all was well.

Don't buy Power 2000 batteries.They are very bad.

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Product Description:
4-pack AA NiMH Batteries AA NiMH Batteries for use with Power2000 AC / DC Battery Charger. Order ONLINE Today! AVAILABLE SEPARATELY: Power2000 AC / DC Battery Charger or 4-pack AAA NiMH Batteries - word search in our Store for 'NiMH Batteries'. 4-pack AA NiMH Batteries

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Powerex A/C Battery Charger/Conditioner - 4 Pack Review

Average Reviews:

(More customer reviews)When I purchased my first digital camera 3 years ago, I never thought it could go through batteries as quickly as it did so I never thought about buying rechargables.Besides, my rechargable history had not been a good one.Very expensive batteries, charger only worked when it wanted to work.

I did quite a bit of research when I purchased my newest digital camera and batteries 6 months ago.The PowerEX batteries and chargers were reviewed quite highly and tested to be long lasting.The price was decent and much lower than I had paid 3 years ago for other rechargables.I figured that I didn't have too much to lose.

Well, six months later I am getting ready to buy more batteries for other items in the house.There were times that I loaded my fully charged batteries in my camera and took over 1000 flash pictures and still had a great charge on the batteries.They hold their charge for weeks and can be charged quickly if needed.

My son uses these in his game cube wireless controlers and gets days worth of playing time from them before needing a charge.

These are inexpensive, ship very quickly, and are a deal for twice the price.I can't imagine having to lug around regular batteries in my camera case ever again.And with PowerEX batteries, I won't have to.

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Product Description:

With this you can safely rapid charge both AA and AAA NiMh and NiCD batteries. You no longer have to wait the endless hours required by ordinary overnight chargers! With Powerex's unique intelligent microprocessor design, your batteries will be at their peak performance at all times. This is an ideal lower priced solution for charging those very important AA's for your Halo hoppers!Features:

Charge AA/AAA ANiMH or NiCD batteries in 2-3 hours
Unique FLEX negative pulse charging algorithm allows the battery to accept a more complete charge
Two independent charging circuits

Includes:

4AA 2500mAh 1.2V NiMH batteries
Auto adapter (12V)
Battery holder

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MAHA MH-C401FS 100 min AA / AAA Battery Charger and Wall AC/ Car DC adapter with Scratch-Guard Protector Bag and X4 2700 Mah Nimh Batteries ***Includes Accessory Bag*** Review

Average Reviews:

(More customer reviews)The MAHA MH-C401FS is marketed as a "100-minute battery charger". But when you use it to charge up the 2700mAh batteries that came with this charger, you'll most likely have to wait for around 160 minutes. So who lied?

The fact is, C401FS charges AA cells at a fixed current of 1000mA (in Fast mode). Several years ago when this charger was first introduced, the average capacity of an AA NiMH cell was much lower. Perhaps back then, it took about 1.6 hours (or 100 minutes) to fully recharge a 1600mAh cell. But today's AA NiMH cells have much higher capacities. So to charge up a 2700mAh cell, it now takes about 2.7 hours (or 160 minutes) to finish the job.

Aside from the misleading marketing claim, the C401FS is actually a decent charger. It is a 'Smart' charger that charges each cell individually, and stops when each cell is full. It also allows you to select between Fast (1000mA) and Slow (300mA) charging. Unless you are in a hurry, choose the slow mode since it is better for the cells. Just remember that it takes about 9 hours to fully recharge a 2700mAh cell in slow mode.

Unfortunately, the C401FS is also way over-priced for a simple charger in today's market. For about the same cost, you may want to consider an advanced battery charger/analyzer, such as the La Crosse BC-900 or BC700 instead.

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Product Description:
Unlike other fast chargers, the MH-401FS allow you to recharge AA & AAA NiMH or NiCD batteries accurately and coolly, in around 100 minutes (AAA charges in around 1 hour) .This charger comes with AC adapter, DC adapter, batteries carrying case, user manual and Scratch-guard protector case for easier transportation, protection and storage. Limited Lifetime Warranty

Get 58% OFF

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Rayovac PS3D Universal Battery Charger for AA, AAA, 9V, C and D Rechargeable Batteries Review

Average Reviews:

(More customer reviews)[IMPORTANT NOTICE on Jan 1, 2010]:
I've been informed (thanks to Domenico Perrella) that the item being shipped now is the 'PS3D', which is an inferior product compared to the 'PS3' described in my original review. If you have ordered the PS3 but received the PS3D instead, return it to Amazon for a full refund - on the ground that the product description does not match the product received.

[Original Review follows]

I already have at least half a dozen smart chargers in the house, including top-of-the-line models such as the La Crosse BC-900 and Maha C9000, but I still wanted this Rayovac Universal Battery Charger (PS3) for the following reasons:

1. It can accept C, D, and 9V batteries in additional to the standard AA and AAA cells.
2. It can handle rechargeable alkaline cells in addition to the standard NiMH or NiCd cells.
3. It has the potential to recharge up to 8 AA or AAA cells at once.

So far, I'm very satisfied with this charger. Of course it is bulky and heavy. But that's to be expected for an unit that can accept four D-cells at the same time. For home use the size and weight is not an issue at all.

I'm happy to report that this charger is a lot smarter than I previously imagined. Unlike a typical dumb charger in this price range (for example: the Energizer CHFCV Overnight Family Charger), the PS3 has four independent charging channels. That means I am free to charge different cell in any channel. Each channel comes with a status indicator LED, which goes out once the cell is fully charged. But most of all, this charger is smart enough to recognize the difference between NiMH cells and alkaline cell, and can pick the correct charging method accordingly.

When an unknown cell is inserted into the PS3, the charger first starts off with a trickle current (800mA peak current at 10% duty cycle, or an average current of 80mA). Based on the voltage profile of this cell, the PS3 can determine whether this is an alkaline cell, or a NiMH cell. After two minutes, the duty cycle is increased to 60%, so the average current is now around 480mA. For a NiMH cell, charging will continue until a negative dV/dt is detected, in which case it switches back to trickle current again. But for an alkaline cell, charging current will gradually decrease with higher terminal voltage until it reached 1.65V.

The Rayovac PS3 is designed to recharge the Rayovac 'Renewal' brand of rechargeable alkaline cells (which are now discontinued). The user manual warned against charging ordinary disposable alkaline cells, but I experimented with it anyway. So far, I have observed very good results with recharging Duracell alkaline AA cells [see warning below]. Of course, the capacity of a recharged alkaline cell is lower than that of a fresh cell, and it drops with each subsequent cycle. But since I can squeeze another half a dozen cycles out of an exhausted alkaline cell at no additional cost, I really should not complain.

Back to the charger itself, I do have a complaint about its claim of"recharge up to 8 AA or AAA batteries". It turns out that each of the four charging channels can accept one to two AA or AAA cells, but the two cells are electrically connected in parallel. So in case somebody accidentally placed two cells of different battery chemistries (NiCd, NiMH, or alkaline) in the same channel, the one with lower voltage will discharge the other one. The charger may also get confused and fail to terminate correctly in such case. It is safer and faster to charge only one AA or AAA cells in each channel.

[WARNINGS:]
1. Do NOT try to recharge alkaline cells that are completely exhausted (terminal voltage below 1V). It will not work.

2. Do NOT try to recharge Energizer alkaline cells. Four Energizer AA cells I tested completely dropped dead after just two discharge/charge cycles. Two D-cells started leaking electrolyte a few days after charging. Luckily they were left outside and not being used.

[Update on Jan 26, 2009]
Out of maybe one dozen Duracell AA alkaline cells I have recharged, two started leaking electrolyte a few weeks later. I must now officially advise AGAINST recharging disposable alkaline cells: do it at your own risk!

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Product Description:
Rayovac PS3D Universal Battery Charger for AA, AAA, C and D Rechargeable Batteries

Get 22% OFF

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