iPowerUS 9V Pro 520mAh (Silver)

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Official specifications:
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

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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

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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

Disassembly

How is the test done and how to read the charts
Compare to other 9V batteries: Alkaline/NiMH/Lithium/other