There are many many batteries out there that if you'd look around - you could get alot cheaper... like watch batteries.
Check out an LR6 battery some time... it's a stack of 4 1.5VDC button cell batteries in a foil wrapper, which equals 6VDC.
Just about every Ni-MH battery pack I've ever taken apart has had a series of standard-cell batteries in it. it's only a "pack" because they're wrapped up and have tab-leads soldered to them, which is quite easy to take care of.
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