January 2010 Entries

Some more details on battery conditions

In a previous post I mentioned that if the voltage drops below 3.3V, it indicates that battery end-of-life is getting close.  I briefly want to elaborate on this. Below is a diagram of the battery discharge based on current draw. It is published by the battery manufacturer, for the battery installed in BSF-8 controls (BSF-7 batteries have similar looking profiles).  As  can be seen, the voltage level is extremely stable and only drops off near the end of the battery’s life.  The green curve best describes the SI control’s profile when the control is active with punches from time to time...

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