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diff --git a/firmware/target/arm/as3525/powermgmt-target.h b/firmware/target/arm
index 511bcc7..3c2111a 100644
--- a/firmware/target/arm/as3525/powermgmt-target.h
+++ b/firmware/target/arm/as3525/powermgmt-target.h
@@ -37,7 +37,7 @@
 #else
 /* ADC_RTCSUP seems to represent battery voltage better than ADC_BVDD during
  * charging (ADC_BVDD is way too high) and appears the same in normal use. */
-#define ADC_BATTERY         ADC_RTCSUP
+#define ADC_BATTERY         ADC_CHG_IN
 #endif

 #elif defined(SANSA_E200V2)