The battery life of my 42s seems to be shorter than normal. I kept the batteries in the battery compartment and seldom use the calculator. Ocassionaly (around a month) I would switch on the calculator and do some calculation or calculator test for several minutes. Last week, as usual, I switched on the calculator only to find out the battery was used up, and I remembered the battery lasted for only around 1.5 year. I also had my 32sII which I used much more frequently and the batteries had been used for more than 3 years without any sign of reaching the end of their life. I also remembered the days when I used my 42s extensively (especially lauching programs which required long time to run) the battery life would be rather short. So what's the real problem? Note: I didn't use the "fast" mode of the calculator.
Also last week, I switched on my 48G, and it displayed the "low battery" message. I switched the calculator off, took the old batteries out, only to find out that I didn't have any new ones. So I just let the calculator without its batteries, and installed the new ones three hours later. Expecting the memory to have been cleared, lo and behold, no memory was lost! Is it normal?