My favourite Braun electric razor (1508) The battery was getting very low on capacity and then it suddenly stopped altogether and no charge/cord operation either. I had previously replaced the battery a few years ago and had modified the internal latch mechanism on the case for easy re-opening by fitting a much less agressive spring and drilling a tiny 1mm hole to that a paperclip can be used to operate the catch rather than forcing the case open at one end to be able to get a screwdriver onto it.
I found that one end of the battery had come unsoldered and that had blown the charging circuit. I needed to replace several transistors, a resistor and the indicator LED plus soldering* in a new freshly charged 2500mHr NiMh battery.
Works a treat now.
I had sourced another motor off ebay just in case as this had failed a few years ago and was replaced. It can go on the spares shelf for when it's needed.
*Not good for batteries but a very hot iron and quickly seems to get away with it.
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History is much like an endless waltz: The three beats of war, peace and revolution continue on forever.
However history will change with my coronation - Mariemaia Khushrenada