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[Equipment] CMS50F oximeter locked up - and FIX!
#1
Smile 
While changing some settings in my pulse oximeter it locked up and became totally unresponsive -- freak software glitch I guess. I could have left it on until the battery went dead but that could take quite a while. This model has a non-removable, (well, not intended to be removed) USB rechargeable battery. A small phillips screwdriver allowed me to take the unit apart. I momentarily short circuited where the battery leads are soldered to the circuit board and the unit turned off. Now working normally. I hope this helps somebody.
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#2
Some batteries have protective mechanisms built in to detect short-circuit conditions and shut down the power cells, but it's not a good assumption. Also the protective circuit could be defective and malfunction at the worst time.

With lithium type batteries especially, shorting could quickly overheat it and lead to fire or injury. The key word in Don's technique, in my opinion, is 'momentarily.'

Good trick, thanks for sharing!

Well-done
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