Duracell Recharge Ultra NiMH 9V 170mAh
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Official specifications:
Duracell%20Recharge%20Ultra%20NiMH%209V%20170mAh-info

A Duracell 9V battery, this is supposed to be high quality, but one of the cells fails.

Duracell%20Recharge%20Ultra%20NiMH%209V%20170mAh-infoAB

One battery is fine, one bad.

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Duracell%20Recharge%20Ultra%20NiMH%209V%20170mAh-Capacity

One battery is fine with more than rated capacity, the other is rather bad.

Duracell%20Recharge%20Ultra%20NiMH%209V%20170mAh-CapacityTime

Duracell%20Recharge%20Ultra%20NiMH%209V%20170mAh-CapacityTimeHours

Duracell%20Recharge%20Ultra%20NiMH%209V%20170mAh-Energy

Duracell%20Recharge%20Ultra%20NiMH%209V%20170mAh-Charge



Conclusion

I supposed you always risk getting a defective product, with this fault most people would probably never detect it.
The working battery is good.



Notes and links

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