Stand by power WP 34s & HP 35s

[Marcus von Cube]

(08-28-2014 11:19 AM)Waon Shinyoe Wrote:  I have the very opppsite impression on these two calculators. The batteries of my 34s can only last for several weeks. I kept my 35s for a short time, but I never met such a situation where the batteries of my 35s was exhausted.

The 34S can consume up to 40mA (IIRC) when doing real work. This is hard for the 3032 cells and can lead to increased internal resistance which in turn causes an early power down even if there is still some juice in the cells. You can set SLOW mode to limit the speed, and thus the maximum current drown. This might help to increase battery life but the trade off is a longer response time in certain situations.

In order to limit the wear on the batteries I step up the processor speed whit a short delay. Many (if not most) operations never reach the point where the speed is set to maximum. Running programs is a different story though...