Soshine 9V LiIon 650mAh (White)
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Official specifications:
Soshine%209V%20LiIon%20650mAh%20(White)-info

This is a two cell LiIon rechargeable battery.
It has over voltage protection at 8.63 and 8.64 volt.
It has over discharge protection at 5.08V and 5.57V.

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Soshine%209V%20LiIon%20650mAh%20(White)-Capacity

The two batteries are just about the same capacity.
The voltage is lower than NiMH and more like a nearly empty alkaline, but it will stay this way for a very long time.

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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 and voltage 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/other