fix tbattery

Author: gbr1

examples/firmware/firmware.ino

@@ -308,6 +308,7 @@ void loop(){
 
   // battery update
   if (millis()-tbattery>1000){
+    tbattery = millis();
     alvik.updateBMS();
     msg_size = packeter.packetC1F('p', alvik.getBatteryChargePercentage());
     alvik.serial->write(packeter.msg,msg_size);