diff --git a/firmware/basic/voltage.c b/firmware/basic/voltage.c
index a60bdd2..4996077 100644
--- a/firmware/basic/voltage.c
+++ b/firmware/basic/voltage.c
@@ -3,21 +3,31 @@
 #include "basic/basic.h"
 #include "funk/nrf24l01p.h"
 
-static uint32_t results=5000;
+static uint32_t voltage=5000;
 static uint8_t chrg=1;
 
 void VoltageCheck(void){
 
     chrg=gpioGetValue(RB_PWR_CHRG);
+    //slow down the adc for our high impedance volatage devider
+    ADC_AD0CR = ((CFG_CPU_CCLK / SCB_SYSAHBCLKDIV) / 100000 - 1 ) << 8;
+	voltage = adcRead(1);
+    //speed it up again
+    ADC_AD0CR = ((CFG_CPU_CCLK / SCB_SYSAHBCLKDIV) / 1000000 - 1 ) << 8;
 
-	results = adcRead(1);
-	results *= 10560;
-	results /= 1024;
-    results += 50;
-	if( results < 3500 ){
+	voltage *= 10560;
+	voltage /= 1024;
+    
+    //add the drop over the voltage switch
+    voltage += 50;
+
+    //battery is assumed empty if the volatge falls bellow 3.5V
+	if( voltage < 3500 ){
         nrf_off();
 	    gpioSetValue (RB_PWR_GOOD, 0); 
-	    gpioSetValue (RB_LCD_BL, 0); 
+	    gpioSetValue (RB_LCD_BL, 0);
+
+        //put the chip into deep power down
 	    SCB_SCR |= SCB_SCR_SLEEPDEEP;
 	    PMU_PMUCTRL = PMU_PMUCTRL_DPDEN_DEEPPOWERDOWN;
 	    __asm volatile ("WFI");
@@ -25,7 +35,7 @@ void VoltageCheck(void){
 };
 
 uint32_t GetVoltage(void){
-    return results;
+    return voltage;
 };
 
 uint8_t GetChrgStat(void){