diff --git a/tconnectsync/eventparser/events.py b/tconnectsync/eventparser/events.py
index 1b3d8b6..550bb0c 100644
--- a/tconnectsync/eventparser/events.py
+++ b/tconnectsync/eventparser/events.py
@@ -4495,7 +4495,7 @@ class LidDailyBasal(BaseEvent):
 
     @property
     def batteryChargePercent(self):
-        return (256*(self.batterychargepercentmsbRaw%2)+self.batterychargepercentlsbRaw)/512
+        return (256*(self.batterychargepercentmsbRaw-14)+self.batterychargepercentlsbRaw)/(3*256)
 
     @staticmethod
     def build(raw):
diff --git a/tconnectsync/eventparser/transforms.py b/tconnectsync/eventparser/transforms.py
index bed437c..daae999 100644
--- a/tconnectsync/eventparser/transforms.py
+++ b/tconnectsync/eventparser/transforms.py
@@ -116,7 +116,7 @@ def transform_battery_charge_percent(event_def, name, name_fmt, field, tx):
     out += [
         '@property',
         f'def batteryChargePercent(self):',
-        f'    return (256*(self.batterychargepercentmsbRaw%2)+self.batterychargepercentlsbRaw)/512',
+        f'    return (256*(self.batterychargepercentmsbRaw-14)+self.batterychargepercentlsbRaw)/(3*256)',
         ''
     ]