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Both RTC can retain time and custom data over blackouts using a backup power source as:
* the lithium rechargeable battery (BT1) that is ''optionally'' mounted on the carrier board.
* an external battery connected to J3 (alternate mounting option to the battery)
[[File:ETRA-EVBEVK-RTCBT1-battery-connector.png|thumb|center|500px300px|RTC BT1 or connectorbattery options]]
===Signals ===