diff --git a/wasp/boards/simulator/watch.py b/wasp/boards/simulator/watch.py
index 6e7fcee..9c45902 100644
--- a/wasp/boards/simulator/watch.py
+++ b/wasp/boards/simulator/watch.py
@@ -9,6 +9,8 @@ from machine import SPI
 from drivers.st7789 import ST7789_SPI
 from drivers.vibrator import Vibrator
 
+button = Pin('BUTTON', Pin.IN, quiet=True)
+
 class Backlight(object):
     def __init__(self, level=1):
         self.set(level)
@@ -16,6 +18,8 @@ class Backlight(object):
     def set(self, level):
         print(f'BACKLIGHT: {level}')
 
+        button.value(bool(level))
+
 class Display(ST7789_SPI):
     def __init__(self):
         spi = SPI(0)
@@ -45,10 +49,10 @@ class Battery(object):
 
     def voltage_mv(self):
         if self.voltage > 4:
-            self.step = -0.005
+            self.step = -0.01
             self.powered = False
         elif self.voltage < 3.4:
-            self.step = 0.01
+            self.step = 0.04
             self.powered = True
         self.voltage += self.step
 
@@ -89,5 +93,4 @@ backlight = Backlight()
 battery = Battery()
 rtc = RTC()
 vibrator = Vibrator(Pin('MOTOR', Pin.OUT, value=0), active_low=True)
-button = Pin('BUTTON', Pin.IN, quiet=True)
 
diff --git a/wasp/clock.py b/wasp/clock.py
index 97919c9..68dc52f 100644
--- a/wasp/clock.py
+++ b/wasp/clock.py
@@ -36,8 +36,9 @@ class ClockApp(object):
     def update(self, watch):
         now = watch.rtc.get_localtime()
         if now[3] == self.on_screen[3] and now[4] == self.on_screen[4]:
-            if now[5] % 2 == 0:
+            if now[5] != self.on_screen[5]:
                 self.meter.update()
+                self.on_screen = now
             return False
 
         display = watch.display