Low battery cell temperature activates the DC heating mat.
Activated: 5 minutes after the battery Cell Temperature drops below 2 °C (36 °F).
Deactivated: 1 minute after the battery Cell Temperature rises above 8 °C (47 °F).
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When the temperature drops below 2 °C (36 °F), after 5 minutes, Relay 2's Normally Open switch (pin 6) is closed (activated) and enables power flow to the DC heat mat to warm up the battery. The switch (pin 6) is opened (deactivated) 1 minute after the battery cell temperature rises above 8 °C (47 °F).