diff --git a/chip-battery.sh b/chip-battery.sh
index 9dfb9cd..06b8e75 100755
--- a/chip-battery.sh
+++ b/chip-battery.sh
@@ -41,8 +41,10 @@ function isBatteryAvailable() {
   local flags=$(i2cget -f -y 0 0x34 0x01)
   if (((( $flags&0x20 ) >>5 ) == $TRUE )); then
     echo "1"
+    return 1
   else
     echo "0"
+    return 0
   fi
 }
 
@@ -65,7 +67,7 @@ function getChargeCurrent() {
 # shuts the system down if too less voltage
 function verifyBatteryVoltage() {
   echo "$(isBatteryAvailable)"
-  if [ "$?" -eq "1" ] ; then
+  if [ "$(isBatteryAvailable)" -eq "1" ] ; then
       local voltage=$(getBatteryVoltage)
       local chargeCurrent=$(getChargeCurrent)
       echo "Voltage: $voltage"
@@ -108,9 +110,9 @@ function main() {
 #  setupGpioInputButton
  echo "hello" 
   while true ; do
-#    setLed 1
+    setLed 1
     verifyBatteryVoltage
-#    setLed 0
+    setLed 0
     sleep 3
   done
 }