PowerEx MH-C9000 WizardOne Charger-Analyzer + 4 Pack AA NiMH Rechargeable Batteries [2700mAh]
by Maha
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Category: CE
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Digital Photo Product Details
Manufacturer: MahaProduct features:
- Four independent slots for AA or AAA NiMH batteries
- large backlit LCD
- Digitally displays battery capacity, voltage, current and time
- Special forming charge and cycling mode; 30 selectable charging and discharging speed.
Digital Cameras Photo Reviews of PowerEx MH-C9000 WizardOne Charger-Analyzer + 4 Pack AA NiMH Rechargeable Batteries [2700mAh]
Customer Review: Very Good Battery Charger
Summary: 4 Stars
Overall, I rate this Powerex MH-C9000 Battery Charger at a Very Good 4 stars out of 5. It does a fine job charging my batteries, lets me know how much charge they're holding, and helps improve that available capacity. My only complaint about the charger is that it seems to be a bit finicky about the placement of AAA batteries. Often, I'll put a AAA battery in and enter the settings only to watch the display for that slot go blank (this is independent of the slot and battery). Reseating and re-entering the parameters usually works. But, it appears that it's very easy for AAA batteries to lose contact with the charger. I've had no such issue with AA batteries. All the rest of my issues (and they're very minor) have to do with the documentation. I've noted them, below:
- Charging Rates: According to the first page of the manual:
"Charging at a rate below 0.33C and above 1.0C is not recommended. Charging too slow may prevent the charger from terminating correctly. Charging too fast may damage the battery."
Yet, on the next page, it says that for Break-In Mode:
"Applies a 16-hour 0.1C charge (0.1 times the capacity of the battery), rest of one hour, followed by a 0.2C discharge, rest again, and finally a 16-hour 0.1C recharge again."
Since Break-In Mode uses a 0.1C and the manual recommends not using anything below a 0.33C rate, these seem contradictory. My guess is that Break-In Mode is a timed mode and the other modes aren't. It's a bit worrisome, though.
- Discharge Rates: Except for the mention of a 0.2C rate used in Break-In Mode, there's nothing in the manual saying what a good rate for us to use in the other modes. A little searching on the web indicates that 0.25C is a reasonable rate.
- Units: Even though the manual gives charging limits in terms of C (capacity of the battery), the limits you enter into the charger are in terms of current (mA). It would have been nice if it had included some examples. For instance, with my 2500 mAh AA batteries, the lower current limit (as specified, above) would be 2500 * 0.33 = 825.0 mA. Just for ease of entry, I'll probably stick to a 900 mA rate on those. For my 970 mAh AAA batteries, the lower limit would be 970 * 0.33 = 320.1 mA (I'll probably stick to 400 mA for those).
- Dead Batteries: The manual is not all that helpful in letting us know when to dispose of a battery as being unsalvageable. In an easy case, the charger runs an impedance test at the start of all charges and if it fails (the display reads "HIGH"), then we should recycle the battery. But, for batteries that aren't faulty, all it says is:
"For batteries that do not perform favorably after using the mode recommended above, the following sequence can be applied.
1. Refresh & Analyze for one to three times.
2. If capacity is still low, use Break-In mode.
3. If the step 1 to step 2 shows some capacity improvement (> 10%), repeat Break-In mode for one to three times. If no significant improvement, battery probably at end of useful life."
Unfortunately, it doesn't say what percentage of capacity is something to worry about. After some searching on the web, I managed to find the following in an April 2001 article written by Isidor Buchmann:
"Specified to deliver about 100 percent capacity when new, the battery eventually requires replacement when the capacity drops to the 70 or 60 percent level. The threshold by which a battery can be returned under warranty is typically 80 percent."
So, my guess is that a battery with an available capacity greater than 80% is ok. If a battery's available capacity percentage is somewhere in the 70s, and if repeated Break-In Mode charges don't increase it by at least 10%, then it's time to consider replacing it. Anything that stays below 70% should just be recycled. Now, at this point, I've run 27 two-year-old AA batteries through the Break-In Mode (some of them, several time). Three of them are just a tad over 90% available capacity, five of them are just below 80% available, and the rest are in the 80% range. That seems reasonable. But, I've run four brand-new AAA batteries through Break-In Mode and only one is (barely) above 80%: the rest are just below 80%. I'll have to see if future charges bring the available capacities up.
More PowerEx MH-C9000 WizardOne Charger-Analyzer + 4 Pack AA NiMH Rechargeable Batteries [2700mAh] reviews:
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Description of PowerEx MH-C9000 WizardOne Charger-Analyzer + 4 Pack AA NiMH Rechargeable Batteries [2700mAh]
MH-C900 WizardOne Battery Charger & Analyzer is suitable for the casual consumer users, enthusiast and professionals, WizardOne is capable of charging, conditioning, analyzing, cycling, forming and discharging one to four AA or AA batteries, all while digitally displaying the battery capacity and voltage. All four slots can be operated independently in different modes and settings. Those seeing the unit for the first time will be struck by its large LCD screen, backlit by ultra-bright white LEDs. Measuring over 3.5 by 1.5, the display is more than three times larger than its closest competition and shows a wealth of information that is easy to read.Products
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