ui: display percentage estimates from battery voltage

lib/logitech_receiver/hidpp20.py

@@ -1170,6 +1170,25 @@ def get_voltage(device):
         return decipher_voltage(battery_voltage)
 
 
+# voltage to remaining charge from Logitech
+battery_voltage_remaining = (
+    (4186, 100),
+    (4067, 90),
+    (3989, 80),
+    (3922, 70),
+    (3859, 60),
+    (3811, 50),
+    (3778, 40),
+    (3751, 30),
+    (3717, 20),
+    (3671, 10),
+    (3646, 5),
+    (3579, 2),
+    (3500, 0),
+    (-1000, 0),
+)
+
+
 # modified to be much closer to battery reports
 def decipher_voltage(voltage_report):
     voltage, flags = _unpack('>HB', voltage_report[:3])
@@ -1194,6 +1213,11 @@ def decipher_voltage(voltage_report):
     elif (flags & (1 << 5)):
         charge_lvl = CHARGE_LEVEL.critical
 
+    for level in battery_voltage_remaining:
+        if level[0] < voltage:
+            charge_lvl = level[1]
+            break
+
     if _log.isEnabledFor(_DEBUG):
         _log.debug(
             'device ???, battery voltage %d mV, charging = %s, charge status %d = %s, charge level %s, charge type %s',

lib/solaar/ui/window.py

@@ -695,7 +695,7 @@ def _update_device_panel(device, panel, buttons, full=False):
 
         if battery_voltage is not None:
             panel._battery._label.set_text(_('Battery Voltage'))
-            text = '%(battery_voltage)dmV' % {'battery_voltage': battery_voltage}
+            text = '%(voltage)dmV, %(level)d%%' % {'voltage': battery_voltage, 'level': battery_level}
             tooltip_text = _('Voltage reported by battery')
         elif isinstance(battery_level, _NamedInt):
             panel._battery._label.set_text(_('Battery Level'))
@@ -909,7 +909,7 @@ def update_device(device, item, selected_device_id, need_popup, full=False):
         _model.set_value(item, _COLUMN.STATUS_TEXT, _CAN_SET_ROW_NONE)
         _model.set_value(item, _COLUMN.STATUS_ICON, _CAN_SET_ROW_NONE)
     else:
-        if battery_voltage is not None:
+        if battery_voltage is not None and False:  # Use levels instead of voltage here
             status_text = '%(battery_voltage)dmV' % {'battery_voltage': battery_voltage}
         elif isinstance(battery_level, _NamedInt):
             status_text = _(str(battery_level))