- Brand Name: PowerGenix
- Model Number: PGX-4AAZiNc-1.6v
- Item Package Quantity: 1
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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From the Manufacturer
NOTE: These batteries cannot be recharged in a standard NiMh recharger. Please use a PowerGenix or other Nickel Zinc charger.
Top Customer Reviews
"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%.Read more ›
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
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.Read more ›
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.
Most Recent Customer Reviews
Junk batteries. Okay for a couple of charges then half of them quit working.Published 12 months ago by David H
I bought these to solve a problem with a canon camera. The camera's low voltage threshold drifted up so that it reported dead batteries when they were essentially new. Read morePublished 21 months ago by C. Potter
I put them in a cat/dog laser toy. The kind that has a rotating head that projects a laser that goes around the device in a pattern to keep the pets interested. Read morePublished on December 14, 2013 by J. Gauthier
These are very good batteries and we love them. They last longer and we don't have to buy new all the time.Published on October 4, 2013 by Amanda Beutel
I bought 4 AAs and a charger at a local close-out store, they were highly discounted. I liked them so much, I went back to that store and bought another charger and several sets of... Read morePublished on September 19, 2013 by Ray
In a flash/Speedlite they do make for fast re-cycling times but the number of flashes you get is not very many.Published on August 26, 2013 by Dave