How many HP-25Cs have we lost?

[Steve Simpkin]

My HP-25 was my first HP. It worked so well that I used it as my only calculator for almost 10 years. That said, the battery charger design was an extremely poor choice and I was very lucky that the combination of ancient batteries and the charger didn’t kill mine. i switched to using alkaline batteries after about 8 years when the NiCads no longer held a charge. It still works great.