iPowerUS 9V Pro 520mAh (Silver)
Official specifications:
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Dimensions: 25.5mm x 16.4mm x 47.5mm
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Nominal capacity: 520mAh / Minium capacity: 500mAh
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Charging voltage: 8.4V ± 0.05V
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Nominal discharging current: up to 500mA
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Nominal voltage: 8.4V ~ 6.5V / Working voltage: 8.4V - 6.5V
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Discharge end voltage: 6.5V
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Storage temperature (in centigrade): 0 - 40 degrees
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Charge temperature: 0 - 40 degrees
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Discharge temperaure:
1045 degrees -
Over voltage protect: 8.50V ± 0.05V
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Low voltage protect: 6.5V (+0.2V/-0.4V)
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Internal resistance: <=450mOhm
![](http://lygte-info.dk/pic/Batteries9V/iPowerUS%209V%20Pro%20520mAh%20(Silver)/iPowerUS%209V%20Pro%20520mAh%20(Silver)-info.png)
This is a two cell LiIon rechargeable battery.
I skipped making the 0.002 and 0.005A curves, they will not be significantly different from the 0.01A curve.
This type of batteries are equipmped with a LiIon protection circuit. I tested one of the batteries it had over voltage protection at 8.35V and over discharge protection at 6.22V
![](http://lygte-info.dk/pic/Batteries9V/iPowerUS%209V%20Pro%20520mAh%20(Silver)/DSC_4452.jpg)
![](http://lygte-info.dk/pic/Batteries9V/iPowerUS%209V%20Pro%20520mAh%20(Silver)/DSC_4453.jpg)
![](http://lygte-info.dk/pic/Batteries9V/iPowerUS%209V%20Pro%20520mAh%20(Silver)/DSC_4460.jpg)
![](http://lygte-info.dk/pic/Batteries9V/iPowerUS%209V%20Pro%20520mAh%20(Silver)/DSC_4459.jpg)
![](http://lygte-info.dk/pic/Batteries9V/iPowerUS%209V%20Pro%20520mAh%20(Silver)/DSC_4455.jpg)
![](http://lygte-info.dk/pic/Batteries9V/iPowerUS%209V%20Pro%20520mAh%20(Silver)/DSC_4456.jpg)
![](http://lygte-info.dk/pic/Batteries9V/iPowerUS%209V%20Pro%20520mAh%20(Silver)/DSC_4457.jpg)
![](http://lygte-info.dk/pic/Batteries9V/iPowerUS%209V%20Pro%20520mAh%20(Silver)/DSC_4458.jpg)
![](http://lygte-info.dk/pic/Batteries9V/iPowerUS%209V%20Pro%20520mAh%20(Silver)/iPowerUS%209V%20Pro%20520mAh%20(Silver)-Capacity.png)
The two batteries has slightly different capacity, but the actual capacity do not change much with load.
The voltage is lower than NiMH and more like a nearly empty alkaline, but it will stay this way for a very long time.
![](http://lygte-info.dk/pic/Batteries9V/iPowerUS%209V%20Pro%20520mAh%20(Silver)/iPowerUS%209V%20Pro%20520mAh%20(Silver)-CapacityTime.png)
![](http://lygte-info.dk/pic/Batteries9V/iPowerUS%209V%20Pro%20520mAh%20(Silver)/iPowerUS%209V%20Pro%20520mAh%20(Silver)-CapacityTimeHours.png)
![](http://lygte-info.dk/pic/Batteries9V/iPowerUS%209V%20Pro%20520mAh%20(Silver)/iPowerUS%209V%20Pro%20520mAh%20(Silver)-Energy.png)
![](http://lygte-info.dk/pic/Batteries9V/iPowerUS%209V%20Pro%20520mAh%20(Silver)/iPowerUS%209V%20Pro%20520mAh%20(Silver)-Charge.png)
Conclusion
These batteries have more than double capacity compared to NiMH 9V batteries and are close to a alkaline battery at low load, except this battery will maintain high capacity at high load.
In moderate to high load situations this looks like a good replacement for alkaline.
Notes and links
How is the test done and how to read the charts
Compare to other 9V batteries: Alkaline/NiMH/Lithium