And you don't know which one it is.
And you don't know the exact voltage it should be.
And it discharges to an unacceptable voltage after a relatively short time.
And the whole thing is a paperweight without the right array of voltages.
Interesting. I was not aware of that safeguard, in the American model I assume. Since the Soviets tended to copy stolen American designs and respond to the same imperatives, something like that battery system may have been incorporated into the Soviet version as well.