AccuEvolution Low Self Discharge NiMH D Cells
by AccuEvolution
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Category: CE
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Digital product summary information
Manufacturer: AccuEvolutionModel: AP-E-10000-2
Product features:
- Very lower self discharge
- Environmentally friendly
- No memory effect
- High capacity
- Fast rechargeable
Digital camera reviews of AccuEvolution Low Self Discharge NiMH D Cells
Digital camera Review: EXCELLENT IN EARLY TESTS, CAN IS A BIT TALL
Summary: 4 Stars
UPDATED DEC 22, 2010
ELECTRICAL: I have only tested eight cells in a very brief way, having only used some of these for a few weeks. D cells are hard to measure as the only charger that gives actual data in numbers, that are accurate, is the Powerex Wizard. Unfortunately this charger is for AAA and AA cells. After much thought I decided to make an external D cell adapter, giving much consideration to making it's impedance as low as possible. First tests were made with other NIMH D cells. These tests produced reasonable and consistant results. Most importantly, the negative delta voltage sensing shut off program in the charger shut off the charge at the right time. The discharge test also worked for all my old cells. It flunked a NUON D cell which was running down faster than it's two mates in the Rayovac lantern. Two weeks later a second NUON D cell failed to fully charge on the Wizard and gave erratic readings on the Wizard's display. A battery autopsy (DON'T OPEN BATTERIES IF YOU DON'T HAVE EXPERIENCE) revealed that inside the D size can was two AA cells in parallel! It is better to find bad cells before a power outage and only a charger with full metering will do this accurately. All my NUON cells went to recycling. No erratic or inconsistant readings have occurred with any of the Accuevolution cells.
The Accuevolution D cells required only about 500- 1000 milliamp/hours to fully charge after opening the package. These cells are from three orders to two suppliers at different times. Each cell( in a 2 pack) took the same amount of charge, indicating that the self discharge of each cell is almost the same. Discharge testing of four cells at the 10 hour rate, shows the 10,000 milliamp/hour rating to be correct, assuming that the advertised capacity is for a 20 hour discharge rate. These are the first precharged rechargeble cells that came with 90%+ charge, that I have found.
After full discharge four cells were fully recharged at 2000 mA, then set aside until cool and charged again at 1000 mA. A final charge at 500mA completed the negative delta sensing test. Even at the the final 1/20 C rate of 500 mA the charger shut down at the right time, causing no overcharge. A cell that gives a good negative delta at this low a charge rate is probably very well made. The 500 mA charge test was repeated once on all six cells. Repeated charging at less than 800 mA is not recommended, in addition depending on auto shut off is not recommended below a 2000 mA charge rate as a general rule for this size cell.
Four cells were set aside for a week and recharged. The amount of recharge needed as a percentage of capacity put this cell in the same self discharge class as the Duracell (white top) precharged AA cells and better than Rayovac Hybrid or Duracell precharged(black top). This makes the claim of 2% per month self discharge plausible, but does not prove it. At worst, self discharge could be 5%/month, based on cells set aside for one month. This is much better than standard NIMH D cells, such as Powerex 11000 mAh.
None of this guarantees a long life but the signs are extremely good.
CHARGING PROBLEM:
In my opinion the bad review of this cell is not the fault of the cell, but rather the charger being used. Most timer based chargers only put out 400 to 440 mA which is too little for this cell. At this rate the cell might not charge, it might just generate heat. NIMH chemistry does not like low current charging, for this cell anything under 900 mA is uncharted territory in my opinion. I suspect the best charge rate will be in the range of 1100 - 1700 mA. I WOULD NOT RECOMMEND MAKING AN ADAPTER FOR THE WIZARD. Check out reviews of the large powerex charger, but do not fill all the slots with cells as it might run too hot if you do this. always leave the slot near the power supply in D cell chargers empty. Any cell in this position will be cooked. Ideally one should use only every other slot so that air can circulate between the cells and cool them.
BATTERY SIZE, OR WILL IT FIT?
Reading other reviews suggests that in some cases the distance between the top of the cell(positive contact) and the bottom is too long. I found no problem with this. What I did find was that the can length (distance from the negative contact to the top of the can) is 2.326 inches. This is longer than any other D cell, primary or rechargeble, that I have on hand. Some battery compartments that have deeply indented positive contacts may not accept this long can. I suggest only buying two if your equipment has a tight fit, and see if there is going to be a problem with the positive contact, or whether the can hangs up on something. The factory may be having trouble maintaining tolerances making all the reviews correct, depending on the production batch. Hence my four star rating.
CONCLUSION:
This could well be the best NiMH D cell available. With the dominance of palm sized devices, larger electronic items are in retreat.
Demand for D cells is low, hence few are made. Few chargers exist that can properly charge these cells. Although not ideal, the Powerex D cell charger is probably the best choice, provided you watch out for overheating. What follows are some precautions when using this and other chargers.
The Wizard charger allows air to reach the cells from under the cells by convection. The cells are spaced apart so this air can rise up between the cells. This charger is limited to AA and AAA sizes. Positive contacts are recessed, hence a cell that is put in backwards will not connect, unless the bottom of the cell is very "bulged out". Bad cells will not heat up the other cells, so they are easily indentified. I check for overheating periodically, especially if I am charging old cells that would overheat if the power is interupted and then returns. Interupting the power causes the charge current on the wizard to default to 1000 mA, too much for low capacity cells. Fortunately the display gives the charge current for each cell on a rotating basis.
All D cell chargers available as of Nov 2010, have the cells almost touching each other, even worse no air can convect as the bottom of the battery holder has no air holes. Some even have covers which contain the heat from any overheating cells.
Although providing extra space between cells would not increase cost much, many would object to the size of a properly vented charger. I am not certain that the Powerex D cell charger is reverse connection proof. The Powerex D cell charger has a reputation for not shutting down if a cell overheats, in my opinion it requires constant supervision. Hence I have not bought one yet.
Fully loading an unventilated charger, set on fast charge, with inefficient low capacity D cells, that are rewrapped Sub C cells, is the ultimate disaster or perfect storm. Accuevolution cells appear to be very efficient and run cooler that any other cells I have tested. They probably will work fine in the Powerex D cell charger. Maha PowerEx MH-C808M Ultimate Professional Charger - Battery charger 8xAA/AAA/C/D
8 Bank Powerex Ulitmate Professional Battery Charger w LCD Display
Summary of AccuEvolution Low Self Discharge NiMH D Cells
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.
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