Dunno if you've sorted it yet, but 8 x 1.2V rechargeables (nicd or nimh) = 9.6V. 8 x dry alkalines = 12V.
That means (unless your KO specifically states do not use dry cells) that you can get away with an 11.1V 3S pack, such as this:
https://demonpowerproducts.co.uk/pro...oducts_id=5039
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