I am this week reviewing European market regarding availability of 9V Block NIMH (8.4V) and (9.6V).
And I did a sad discovery, all major shops they have only two or three brands available.
And from these branded products there is available only a product per brand.
For example ...
Duracell 9V Rechargeable 6HR61/DC1604 8,4V - NIMH 170mAh
Weight 40 g ± 1 g
Internal resistance approx. 20mΩ
Varta 56722 9V Ready2Use rechargeable battery Ni-MH 1.2V/200mAh
Weight /piece 36g
Internal resistance (unknown)
And in Greece I have an third option which I am exploring, and this is Powerex 9V Block NIMH (8.4V) 300mAh
Regarding Duracell and Varta, I am unable to find on-line any technical specification documents.

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By checking 9V Block chargers specifications.VARTA charger (two models), both supply
35 mA as charging current.
To be continued .....