With spring training
just around the corner, we can use Yogi Berra's quote "déjà vu all over
again," and return to the puzzle posted at the end of last season. You may
recall that a major customer of a high performance battery manufacturer has a
critical mission specific performance expectation from the lithium batteries
they purchase. The quality technician for the manufacturer can only authorize
shipment of all of the batteries from each manufactured lot after a statistically
valid sampling and subsequent testing of all the batteries in that sample have
been performed. If just one of those tested batteries does not at least meet
the minimal charge/discharge specifications established by the customer, none
of the batteries in that manufactured lot will be shipped to this customer. Three
different charge/discharge tests are performed. A range of expected battery
performance as indicated by these three tests is shown in the performance
graphs below.
One battery under
test had the following recovery characteristics:
- It recovered %80 percent after it was 100% discharged and recharged 500 times
- It recovered %75 percent after it was 50% discharged and discharge/recharged 600 times and
- it was 30% discharged in less than 30 minutes and recovered %70 percent after 1,200 charge/discharge cycles.
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