adjust battery curve (#8137)

Co-authored-by: HarukiToreda <116696711+HarukiToreda@users.noreply.github.com>

Author: shortwavesurfer2009

variants/nrf52840/heltec_mesh_pocket/variant.h

@@ -120,7 +120,7 @@ No longer populated on PCB
 #undef AREF_VOLTAGE
 #define AREF_VOLTAGE 3.0
 #define VBAT_AR_INTERNAL AR_INTERNAL_3_0
-#define ADC_MULTIPLIER (4.90F)
+#define ADC_MULTIPLIER (4.6425F)
 
 #undef HAS_GPS
 #define HAS_GPS 0
@@ -129,4 +129,4 @@ No longer populated on PCB
 }
 #endif
 
-#endif
+#endif