Test/review of iPowerUS 9V Pro 520mAh (Silver)

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HKJ
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Test/review of iPowerUS 9V Pro 520mAh (Silver)

iPowerUS 9V Pro 520mAh (Silver)
DSC_4454
Official specifications:


  • Dimensions: 25.5mm x 16.4mm x 47.5mm
  • Nominal capacity: 520mAh / Minium capacity: 500mAh
  • Charging voltage: 8.4V ± 0.05V
  • Nominal discharging current: up to 500mA
  • Nominal voltage: 8.4V ~ 6.5V / Working voltage: 8.4V – 6.5V
  • Discharge end voltage: 6.5V
  • Storage temperature (in centigrade): 0 – 40 degrees
  • Charge temperature: 0 – 40 degrees
  • Discharge temperaure: -10 – 45 degrees
  • Over voltage protect: 8.50V ± 0.05V
  • Low voltage protect: 6.5V (+0.2V/-0.4V)
  • Internal resistance: <=450mOhm

iPowerUS%209V%20Pro%20520mAh%20(Silver)-info
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
DSC_4452 DSC_4453
DSC_4460 DSC_4459
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iPowerUS%209V%20Pro%20520mAh%20(Silver)-Capacity
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.
iPowerUS%209V%20Pro%20520mAh%20(Silver)-CapacityTime
iPowerUS%209V%20Pro%20520mAh%20(Silver)-CapacityTimeHours
iPowerUS%209V%20Pro%20520mAh%20(Silver)-Energy
iPowerUS%209V%20Pro%20520mAh%20(Silver)-Charge
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

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

sixty545
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Thanks for the test!
I have read about another brand of 2S LiPo dying early because of lack of an internal balancing circuit (could be a BQ29200). I would not buy such a battery unless I was sure that it has balancing. I hope you can provide that information in future tests.
Do you have the ZNTER 9V battery (9.5V) in queue?. It is a 2P LiPo with output booster and therefore does not need balancing. I have a few of those and also some Soshine 650mAh (2S=7.4V) that I would like to know the quality of.

HKJ
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sixty545 wrote:
Thanks for the test! I have read about another brand of 2S LiPo dying early because of lack of an internal balancing circuit (could be a BQ29200). I would not buy such a battery unless I was sure that it has balancing. I hope you can provide that information in future tests. Do you have the ZNTER 9V battery (9.5V) in queue?. It is a 2P LiPo with output booster and therefore does not need balancing. I have a few of those and also some Soshine 650mAh (2S=7.4V) that I would like to know the quality of.

Checking for a balancing circuit would require opening the battery. I doubt it has balancing circuit, when I check 2S packs they are always without.

I am working on the ZNTER.

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

sixty545
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Location: Denmark (GMT + 1)

HKJ wrote:

Checking for a balancing circuit would require opening the battery. I doubt it has balancing circuit, when I check 2S packs they are always without.

I am working on the ZNTER.


Great!
If you do not open the ZENTER, I can add a (nice) photo of the circuit board with charger, protection and booster-IC’s. It was easy to open with 2 screws under the wrap.
HKJ
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sixty545 wrote:
HKJ wrote:

Checking for a balancing circuit would require opening the battery. I doubt it has balancing circuit, when I check 2S packs they are always without.

I am working on the ZNTER.


Great!
If you do not open the ZENTER, I can add a (nice) photo of the circuit board with charger, protection and booster-IC’s. It was easy to open with 2 screws under the wrap.

I was not planning on opening it in the review, but I hope at a later date to open a couple of 9V batteries.

You are welcome to add your picture to my review when I publish it.

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

arekm
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sixty545 wrote:
If you do not open the ZENTER, I can add a (nice) photo of the circuit board with charger, protection and booster-IC’s. It was easy to open with 2 screws under the wrap.

Could you post these photos ? Hopefuly IC symbols are readable.

Is there really a protection circuit inside?

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