Varta 9V 200mAh (Green)
Official specifications:
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Type: Ni-MH
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Capacity: 200 mAh
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Voltage: 8.4V
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Size: 48,5 x 17,5 x 26,5 mm
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Low self discharge
This is a 7 cell NiMH battery.
At low load the battery has the specified capacity and it looses some capacity with, but nothing like a Alkaline battery.
The battery is rated 8.4V and for most of the runtime it will have higher voltage than a 9V Alkaline.
Conclusion
The NiMH 9V batteries has considerable less capacity than 9V Alkaline, but can handle much higher power.
This battery looks like a good one.
Notes and links
How is the test done and how to read the charts