Product Description

The AccuEvolution ready-to-use rechargeable battery offers the advantages of both alkaline and NiMH cells without their disadvantages. Similar to NiMH rechargeable batteries AccuEvolution can be recharged up to 1000 times. But unlike NiMH batteries they keepmost of their capacity over time.

AccuEvolution batteries outperform even top-notch NiMH batteries with higher initial capacity. While conventional rechargeable batteries loose 20% of their capacity every month, AccuEvolution looses only 2% of its capacity every month. After only 1 month the AccuEvolution 2200mAh AA cell offers more useable capacity than a more expensive, conventional NiMH 2700mAh AA battery. Meaning, for instance, that your flashlights will still shine bright even after months of storage.

Product Details

• Brand: AccuPower
• Model: AP-E-10000-2

Features

• Very lower self discharge
• Environmentally friendly
• No memory effect
• High capacity
• Fast rechargeable

Customer Reviews

Great Batteries (THESE BATTERIES ARE WITH IN SIZE SPEC)
I almost did not buy these batteries 1 year ago based on a review criticizing their size (too long or so). In the end I bought a set of 8 AND I CAN TELL YOU THAT THEIR SIZE IS NOT A PROBLEM based on my experience.

I use a battery charger that does not use springs to recharge these batteries(POWEREX MH-C808M BATTERY CHARGER AA AAA C D NiMH NiCD), and I have NO PROBLEMS placing the battery in the charger. The advertised capacity is correct and they are indeed very low self discharge.

Sure Eneloop AA are great SANYO eneloop 4 Pack AA NiMH Pre-Charged Rechargeable Batteries(I own quite a few of them and couldn't be happier), but they drain fast if your application requires D batteries and it's a pain to recharge them on a weekly basis.

Previously I used AA Eneloop with their D size adapters, but I started to get annoyed about having to replace/recharge batteries almost every week.

**** Update May 14, 2009 ****

THESE BATTERIES ARE WITH IN SPEC.

I measured my AccuPower D batteries and they are about 59.6 mm. The ANSI spec call for 60.5 mm +/- 1.0 mm (not 61.5 mm). Therefore, the battery should measure between 59.5 mm to 61.5 mm. This makes the battery with in spec!

In fact, these are their specs:
[...]

**** Update Sept 12, 2009 ****

In response to a comment I remeasured these batteries stacked using a Stanley 30' Powerlock measuring tape. I did this because I do not have a caliper and my previous measurement may be off compared to a caliper measurement.

The premise is that if the batteries are too long, then stacking them will make the length problem obvious even to a measuring tape. Here are the results:

1) I staked four cells and measured again as best as I could with my measuring tape and got almost exactly 9.5 inches or 241.3 mm which translates to 60.325 mm per battery.
2) Next I staked eight cells and did the same thing. I got about 19 3/16 inches or 487.3625 mm which translates to about 60.92 mm per battery.
3) Next I staked twelve cells and got about 28 10/16 inches or 727.075 mm which translates to about 60.59 mm per battery.

The measurements were not caliper quality but I got a measurement range between 60.325 to 60.92 inches. This new set of measurements puts Bill King and I about 0.875 to 0.28 apart. Note Bill King, my previous and new measurements are all with in ANSI spec though.

These batteries are non-standard length.
Be aware that the AccuPower D cells are not precisely the same size as standard D batteries; rather they are a bit longer. Four of these batteries placed end-to-end are about 1/8 inch longer than 4 standard, say, Energizer Alkaline D batteries placed end-to-end. That is only about 1/32 of an inch extra length per battery, but it was enough extra that I was unable to insert these AccuPower batteries into an O2 Cool battery powered fan calling for D batteries which I bought from Walmart as part of my emergency hurricane kit. Ordinary Energizer Alkaline D batteries fit fine. This was quite disappointing, especially when you consider the cost of the AccuPower cells. Other electrical appliances may not be so exacting regarding inserting the D batteries, and these batteries might work fine there, but it is startling that anyone would produce a D battery that is not the standard size. I have posted a photo which you can view; see the thumbnail photo link under the product photo.

Unknown battery or charger problem
I purchased a large number of AccuEvolution rechargeable D, AA and AAA batteries from RealGoods last year. Eight of the batteries I received were dead on arrival and they wouldn't charge in the AccuManager 20 charger, which I purchased at the same time. I sent those batteries back to RealGoods and received replacements. Over the next few months more batteries failed to charge on the same changer. I had over a 50% failure rate in the most expensive D batteries and they continue to fail. I had a fairly high rate of failures on the AA batteries, although no where near the failure rate of the D batteries. After three months RealGoods would no longer replace the batteries and they referred me to the manufacturer. The manufacturer agreed that my usage pattern should not have been the cause of the failures. I returned several of the D batteries to them and they stated that one of the batteries could not be charged and they had to wakeup the other two. In the mean time four additional batteries have failed to recharge (3 D batteries and 1 AA battery). I have also been using a lot of the Sanyo eneloop AA rechargeable batteries and I have had no failures so far on the same charger.

Followup:

Since I first reported this problem, I ordered 8 D batteries from Tenergy and I now appear to be having the same problem with the Tenergy batteries. Two of the first four I tried to charge would not charge, but after leaving them in the AccuManager20 charger for a couple of hours, one of the batteries started to charge. The AccuEveloution manufacturer sent 6 new D batteries on 10/22/2009 to replace the batteries that appear to be failing. After months of testing and rotating various batteries the problem appears to be more pronounced and the problem may be the charger. On 10/26/2009 a representative of the manufacturer offered to send a replacement charger to see if the charger is causing the problem. I will upgrade this review, if that turns out to be the case.