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I pulled out my HP35 that I bought in 1973. The batteries were shot so I re-built the battery pack with 2000 mAh Ni-MH batteries. Calculator works great after 50 years. Next I modeled the original battery holder and printed with my 3D printer. Loaded it up with batteries and works like original. Photo of original and my 3D print is attached.

https://live.staticflickr.com/65535/5342...f72e_b.jpg
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