Absolutely certain. As a 7 year resident of Kazakhistan and his wife a Russian doctor, I tend to trust their word on translations.
My guess is the 10 minutes could be continuous transmission which will soak up the power. Just sitting on standby recieving messages it's probably going to last a fair while longer.
It is worth mentioning though that radios from all countries around the 50's and 60's tended to weigh a tonne, mainly because to the inefficiency of batteries. Just think of the size mobile (cell) phones where in the late 80's eary 90's and how limited their batteries where.
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If it moves, shoot it, if not push it, if it still doesn't move, use explosives.
Nothing happens in isolation - it's called "the butterfly effect"
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