I don't know if the calculator can withstand 5.0VDC at all/for an extended period/? Nor can I find any documentation about supply voltage tolerances for the HP-45. The calculator is specified at 3.75 volts. Standard USB power specs center around a nominal 5.0VDC. It uses the power connections (and only the power connections the computer does not recognize the calculator as an attached device) to provide power to the HPxx (and to charge its battery, if you have one).My only reservation is the voltage. Whoever designed it has married a standard USB 1.0 A connector to the special-purpose battery connector for the HPxx calculators. I found a vendor selling batteries (and bought one), but when the batteries run down, what do I do?That's when I stumbled on this USB charger assembly. Still, those of us who bought one at the time like to get them out every once in a while.If you're like me, your original battery has leaked and you've lost your plug-in charger. al., pocket calculators, revolutionary when first introduced in 1972, have long since outlived their indispensability.
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