# Determine a battery backup use case ## Problem environment Reference designs for SAMR34 based devices include a coin cell battery connected to PB03, which seems to be unable to power the device. It is considered a battery backup. ## Steps to reproduce 1. Create a Microchip account 1. Download *SAMR34 IC Reference Design Package* 1. Observe the printed schematic 1. Compare battery backup circuits ## Expected result The battery backup reference circuit matches our design (connected to PB3) and describes the method of use. ## Actual result There is little information regarding a use case for the battery circuit. ## Workaround Avoid using the battery for operation and assume it keeps MCU values stored after power is lost. ## Severity level This is **low priority** because project requirements do not include a battery circuit.