I have a heart rate monitor that uses a proprietary charging cable - that I have misplaced.
The charging area looks like this:
Is it possible to use an existing micro-usb cable and hack it to make this charge?
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To be able to do this job, you need to know the following:
Voltage required by the device: you need to stick to the exact rating.
Current required by the device: to choose a charger that can at least supply that amount of current.
Polarity of charging terminal: so you don't mix the positive and negative and damage the device.
Have or be able to get a very similar terminal in shape to make a secure connection.
To know this information, you can either find it on the device, user manual of the device or just Google it for that specific model.