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re: a wall-wart alternative
15 jan 2006
daestrom wrote:
>>>... i got in the habit over the years of buying nine new 9v batteries each
>>>october and changing the batteries in the smoke detectors...
>... i test them monthly, and replace the battery yearly regardless of their
>state of charge.
if you and your family are worth $10 million and non-pumped batteries have
a 2 year mttf and pumped batteries have a 10 year mttf, with a 2 week mttr
for both, (because it takes a month to discover them) and you have a fire
every 10 years, does your battery changing save money, on average?
nick
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