HP30B retunrning to "default values"

[Katie Wasserman]

The low battery warning does not work in these machines and your 30b will resent when the battery voltage gets too low. This is unfortunately a very common occurrence with all the new HP ARM-based calculators. The power supply design is just horrible, they've put 2 CR2032 cells in parallel instead of using them blocking diodes so that one cell won't drain the other when it's exhausted or shorted.

I recommend that you buy a good supply of 2032 cells, they're under $0.25 on Amazon and elsewhere and change them often and carefully. "Carefully" because it's pretty easy to short the battery contacts when inserting a new cells and you'll reset the calculator.