R9370 won't work
Any corrosion on the rechargeable batteries usually means that they've gone bad.
For an relatively easy to fix test, disconnect one end of one of the cells wherever it's easiest to solder back together. Then plug in the shaver and see if it works. The LCD may not work, but the shaver itself might.
Looking it up further, I see that it uses a 12VDC cord/charger. So if you try my suggestion, the LCD and shaver should work when plugged in, if the batteries are the problem.
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