diff --git a/src/Sensors/BatteryController.hpp b/src/Sensors/BatteryController.hpp
index 35b5d4f..d428178 100644
--- a/src/Sensors/BatteryController.hpp
+++ b/src/Sensors/BatteryController.hpp
@@ -25,15 +25,12 @@ class BatteryController {
     int percent(const float minVoltage = 7.2f, const float maxVoltage = 8.4f,
                 const float r1 = 3.3f, const float r2 = 2.f, const float k = 2.87f) {
         auto batteryVoltage = measureVoltage() * ((r1 + r2) / k);
-        return round(_map(batteryVoltage, minVoltage, maxVoltage, 5.f, 100.f));
+        auto percent = ((batteryVoltage - minVoltage) / (maxVoltage - minVoltage)) * 100;
+        return constrain(round(percent), 0, 100);
     }
 
   private:
     uint16_t _battery_pin;
     uint16_t _battery_data_switch_pin;
     static constexpr const char *_tag = "BatteryController";
-
-    float _map(float x, float in_min, float in_max, float out_min, float out_max) {
-        return (x - in_min) * (out_max - out_min) / (in_max - in_min) + out_min;
-    }
 };
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