Then you have to change just a battery, the big ones or the small ones, not the three at the same time.
You have these different batteries to have a backup battery when changing, not to lose your information.
The calculator has 2 big batteries (CR2032) that are the ones that make the calculator work, and a small one (CR1220) which is the one that saves the memory when the battery is changed. First of all, I tell you how you should have changed the batteries in case you have not done it yet, to make you know by the next time. That problem is very common and easy to solve. Message: I cannot make the calculator work after changing the batteries, the TM, SN error codes appear, and nothing works. I got an email of someone whoes calculator Casio 880 is having troubles after changing the batteries, as it is a very common failure on Casio FX-880P and FX-850P, I write here the question and the solution.
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