This is my late father’s #TexasInstruments #calculator SR-56. It still works fine, no LED display problems. 😊 I replaced the old 600 mAh NiCd batteries with a 1150 mAh LiPo battery and a TC4056 USB-C charging board. Plus a 3D printed battery cover. Now everything fits & works fine. #sr56 #3dprinting
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