Should I use an External Battery on my Zymkey / HSM?

The following table compares Zymkey and HSM operational modes while connected to Main Power, Battery Power, and No Power.

The battery is required to maintain the Real Time Clock and the perimeter detect circuits when the host power is removed. Without the battery, these two functions will not be active when the host power is removed.

Battery Functions Matrix

For more information, reply to this post or contact a Zymbit employee directly.