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Johnny Shek · 10-04-2018, 08:10 AM

Several cases of dead HP-15C were reported such that the calculator couldn't power on after installing new batteries. My HP-15C was bought in August, 1985 and was being used quite often for 5 years and then intermittently for the remaining years. Batteries remained in the battery compartment although the low battery indicator (asterisk) was blinking. After the calculator couldn't power on, I bought new batteries and replaced them with new ones. However, it didn't power on and looked dead for two days but the new batteries still stayed in the battery compartment. I kept on pressing the ON button and other buttons one by one randomly twice a day. On the third day, 'running' suddenly popped up on its display. Yes, it revived!

I don't know how far my HP-15C can go but I'm thrilled to have it back at this instant. Have faith in your HP-15C!