It's been just over 12 months since I installed a fresh AA battery into an early Joule Smasher Led Flasher. The battery voltage over that time has been on track to last 10 years.
The graph below has two curves. One is the best AG3 cell result which lasted some 19 days. If a AA battery was to last 10 years then the 3650 days could be scaled to 19 days. One day for the AG3 cell would represent 193 days for the AA battery. As long as the AA voltage on the scaled axis is above the AG3 cell voltage then I consider the AA is on track to meet the 10 year lifespan.
So far, everything is on track to meet the expected 10 years of life. While I changed the timing in the early stages (~1ms till Day 89, 10ms till Day 113, 3ms thereafter) I don't believe this will seriously detract from the test results. The AA battery voltage after 378 elapsed days, or 1.96 days after scaling, is 1.416 volts.
While comfortably above the AG3 curve the voltage is starting to fall to the levels where the AG3 cells all showed a flattening in the discharge curve. If the discharge curve does not flatten out like all the previous test results the AA battery is presently forecast to last 8 years.
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