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  • PowerGenix PGX-4AAZiNc-1.6v High Voltage Rechargeable AA Batteries - 4 Pack
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PowerGenix PGX-4AAZiNc-1.6v High Voltage Rechargeable AA Batteries - 4 Pack


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  • High Voltage 1.6v AA Offers improved performance for any high drain devices especially Digital Cameras.
  • Approx 30% Higher Voltage vs ordinary rechargeables 1.6v NiZn vs 1.2v NiMH

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Technical Details

  • Brand Name: PowerGenix
  • Model: PGX-4AAZiNc-1.6v
  • Item Package Quantity: 1

Product Details

  • Product Dimensions: 0.8 x 3.8 x 4.5 inches ; 3.2 ounces
  • Shipping Weight: 6.4 ounces
  • Shipping: This item is also available for shipping to select countries outside the U.S.
  • ASIN: B0029LHXG2
  • Item model number: PGX-4AAZiNc-1.6v
  • Average Customer Review: 3.3 out of 5 stars  See all reviews (49 customer reviews)
  • Date first available at Amazon.com: June 5, 2009

Product Description

Product Description

PowerGenix 4 Pack AA 1.6v High Voltage Nickel Zinc Rechargeable cells 2500 mWa

From the Manufacturer

PowerGenix has developed a high-energy density, high-cycle life and low-cost nickel-zinc (NiZn) battery ideal for applications that demand high discharge rate capabilities. The technology offers compelling performance advantages, most notably a 30% weight and size reduction coupled with higher power and superior low temperature discharge behavior. Two of the more prominent features of the PowerGenix NiZn battery are its small size and low internal resistance, which enables the delivery of significantly more power during periods of peak demand than a nickel-cadmium (NiCd) or nickel-metal hydride (NiMH) battery of comparable size. Although the design and construction of the cell is similar to NiCd, the higher voltage of PowerGenix's NiZn cell results in a 25% lower cell requirement in multi-cell packages, representing significant space and cost savings.

NOTE: These batteries cannot be recharged in a standard NiMh recharger. Please use a PowerGenix or other Nickel Zinc charger.

Customer Reviews

After two or three years, they had all failed.
Ray
Hydrogen is generated by a NiZn battery whose voltage falls below 0.42 volts, as electricity flows through it from another battery that is at its normal voltage.
R. Clark
It charges in pairs, but only has one indicator light.
Gregory King

Most Helpful Customer Reviews

210 of 220 people found the following review helpful By NLee the Engineer HALL OF FAMETOP 50 REVIEWER on July 19, 2009
On first glance, the PowerGenix Nickel-Zinc Rechargeable Batteries seem to offer many advantages over ordinary rechargeable NiMH cells: higher voltage, higher energy density, lighter weight, longer cycle life, and so on. But before you rush to replace all your rechargeable batteries with NiZn type, let's examine each claim carefully to separate marketing hypes from technical facts:

"30% Higher Voltage" [FACT]
The NiZn cell has a nominal voltage of 1.65V, which is 30% higher than that of a NiMH cell (1.25V nominal). When freshly charged, its terminal voltage is even higher at 1.85V!

"33% Higher Energy Density" [HYPE]
The PowerGenix AA cells are marketed as "2500 milli-WATT-hour" (energy capacity). Most people may confuse this with "2500 milli-Ampere-hour" (charge capacity). But the data sheet for NiZn AA cell shows that its current capacity is only 1500mAh (this is verified by my own testing). It turns out that an 1500mAh NiZn cell actually contains the same amount of energy as a 2000mAh SANYO eneloop AA cell.
- Energy in eneloop AA cell: 1.25V * 2000mAh = 2500mWh
- Energy in PowerGenix AA cell: 1.65V * 1500mAh = 2475mWh

"30% weight and size reduction" [HYPE]
The weight of each NiZn AA cell (25g) is about the same as NiMH AA cell (27g for eneloop). For certain applications, it is possible to use three NiZn cells (3*1.65=5V) to replace four NiMH cells (4*1.25V=5V). But doing so also shortens run time by 25%.
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46 of 47 people found the following review helpful By Gregory King on February 5, 2010
Verified Purchase
I'd love to love these batteries, but they haven't solved the quality control problems. My first set had a cell stop charging after only a few uses. I had them replaced, but am still having problems. Used in sets of 4, one cell will invariably die out early. Since most devices won't complain since the voltage is still higher than 4 NiMH cells, that weak cell gets overdischarged. Then, it won't charge properly.

The Powergenix charger exacerbates the problem. It charges in pairs, but only has one indicator light. So put in a bad cell with a good cell, and it won't charge either. But put in 3 good cells and one bad cell, and the light will indicate. However, only TWO of the cells are being charged. The light turns green, but two cells are still uncharged. The dead cell can only be rejuvenated by a high voltage pulse, but you may not know which "paired" cell to charge with. Pair it with a good cell, and it will either not charge completely, or overcharge the good cell.

So now I'm forced to baby my cells to avoid overdischarging any of them, and possibly starting to mark cells and track them to find stragglers. Now if I'm lucky, I'll have ONE working set after buying two...and it's a laborious science project every time I need to recharge them to make sure I actually get out anything useful. Maybe if I'm lucky the remaining cells will put themselves out of my misery
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24 of 24 people found the following review helpful By R. Clark on December 27, 2010
These NiZn batteries produce significant amounts of hydrogen gas under some conditions that are normal operating conditions for other types of AA batteries such as nickel metal hydride (NiMH) batteries.

First, these NiZn batteries operated well for a few dozen cycles in a one-cell flashlight with about a 0.5 watt power draw.

But a couple of days ago I put them in a two-cell flashlight with about a 1.75 watt power draw. This light is waterproof, sealed with o-rings. The batteries worked fine when I used the light to walk through the woods a few times and for other short duration uses.

Tonight I used the light for about an hour and a half to two hours. While working on some plumbing I noticed that the flat rubber switch cover was distended into a hemisphere, bulging out half an inch above its housing. This happened during a period of a few minutes since the time I had last handled the light. The rubber cover felt hard when touched, and I couldn't press the switch to turn the light off. Subjectively, it felt like pressing my thumb on a 10-speed bicycle tire to check its tire pressure. The head of the milled aluminum flashlight was somewhat more than lukewarm, but that is its normal operating temperature. The lamp was operating at normal brightness. Nothing else seemed unusual.

I was wearing safety glasses at the time, and unscrewed the tailcap next to an air vent. The gas pressure escaped with a pop. When removed, the batteries were slightly warm. There was a small drop of clear liquid at the base of one of the batteries, but no other visible residue. The batteries themselves were not bulged, which means that they must have effective gas vents built in. One of the batteries measured 1.
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11 of 12 people found the following review helpful By Markyp00 on September 20, 2010
Verified Purchase
I have been using these NiZn batteries for nearly a year. As an EE, I was intrigued by the higher open-cell voltage.

Indeed, this higher voltage allows for better performance in applications where battery voltage has a significant impact; e.g. Digital Cameras, electric razors, electric toothbrush, flashlights, fans, etc.

The only drawback is that you MUST use a charger designed for these batteries. The higher voltage and charging characteristics require special circuits.

Be aware also that their mAh rating may not last as long as NiMh cells with the same rating, as the higher voltage means they deliver higher current as well (depending on your application). However, with many digital cameras shutting down at about 1.15V, these batteries will outlast NiMh due to the higher 1.4V knee as the batteries become depleted.

I have 12 of these AA cells; at this point they have performed as expected. I recently returned from a trip, using only one set of two AA cells in my digital camera. I never needed my spares.
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