From 46272a854ef8e8be50c00246f382e020acdb848f Mon Sep 17 00:00:00 2001
From: kopecdav <david.kopecky@satoshilabs.com>
Date: Fri, 9 May 2025 13:07:18 +0200
Subject: [PATCH] fix(core) fuel gauge not updated while charging is IDLE. [no
 changelog]

---
 core/embed/sys/power_manager/fuel_gauge/fuel_gauge.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/core/embed/sys/power_manager/fuel_gauge/fuel_gauge.c b/core/embed/sys/power_manager/fuel_gauge/fuel_gauge.c
index f97e97fed3..dc9ac34ad3 100644
--- a/core/embed/sys/power_manager/fuel_gauge/fuel_gauge.c
+++ b/core/embed/sys/power_manager/fuel_gauge/fuel_gauge.c
@@ -62,6 +62,11 @@ void fuel_gauge_initial_guess(fuel_gauge_state_t* state, float voltage_V,
 
 float fuel_gauge_update(fuel_gauge_state_t* state, uint32_t dt_ms,
                         float voltage_V, float current_mA, float temperature) {
+  if (current_mA == 0.0f) {
+    // No current flow, return latched SOC without updating
+    return state->soc_latched;
+  }
+
   // Determine if we're in discharge mode
   bool discharging_mode = current_mA >= 0.0f;