From J. D. Woods
Peppermint Grove, Western Australia
Michael Rego might have saved himself a lot of trouble had he tried this
method of getting his cellphone and Global Positional System receiver to work
again (Feedback, 28 September).
When the batteries of my electric shaver run down, I freshen up the ends of
the batteries and their contacts in the shaver with a nail file or a pen-knife.
As a result, the life of my batteries is almost doubled—at these low
voltages even a few ohms make a big difference.
Even if Rego had neither of these simple tools, a small rough stone would
have done the trick just as well.
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