From 7223395740685cb57c2dae0b155ca50964ab826c Mon Sep 17 00:00:00 2001
From: pelgraine <140762863+pelgraine@users.noreply.github.com>
Date: Fri, 13 Feb 2026 18:36:17 +1100
Subject: [PATCH] Improved device ui battery rendering for more accurate
 battery indicator

---
 examples/companion_radio/ui-new/UITask.cpp | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/examples/companion_radio/ui-new/UITask.cpp b/examples/companion_radio/ui-new/UITask.cpp
index 6ccf07b5..8d28c8a0 100644
--- a/examples/companion_radio/ui-new/UITask.cpp
+++ b/examples/companion_radio/ui-new/UITask.cpp
@@ -111,9 +111,10 @@ class HomeScreen : public UIScreen {
 
 
 void renderBatteryIndicator(DisplayDriver& display, uint16_t batteryMilliVolts) {
-    // Use voltage-based estimation to match BLE app readings
-    uint8_t batteryPercentage = 0;
-    if (batteryMilliVolts > 0) {
+    // Use the BQ27220 fuel gauge SOC register for accurate percentage.
+    // Falls back to voltage estimation if the fuel gauge returns 0.
+    uint8_t batteryPercentage = board.getBatteryPercent();
+    if (batteryPercentage == 0 && batteryMilliVolts > 0) {
       const int minMilliVolts = 3000;
       const int maxMilliVolts = 4200;
       int pct = ((batteryMilliVolts - minMilliVolts) * 100) / (maxMilliVolts - minMilliVolts);