diff --git a/Core/Inc/soc_estimation.h b/Core/Inc/soc_estimation.h
index f341836..237d92e 100644
--- a/Core/Inc/soc_estimation.h
+++ b/Core/Inc/soc_estimation.h
@@ -7,12 +7,12 @@ extern uint8_t current_soc;
 
 
 #define N_MODELPARAMETERS 11
-#define BATTERYCAPACITYAs (21000.0*3600) //TODO Check if value is correct Cap in Ah * 3600 (Convert to As)
+#define BATTERYCAPACITYAs (20000.0*3600) //TODO Check if value is correct Cap in Ah * 3600 (Convert to As)
 
 
 void soc_init();
 void soc_update(int32_t shunt_current);
-void soe_update();
+float soe_update();
 void soap_update();
 
 #endif // INC_SOC_ESTIMATION_H