diff --git a/Tools/AP_Periph/battery.cpp b/Tools/AP_Periph/battery.cpp
index f4ccd0f939221..368597b540baa 100644
--- a/Tools/AP_Periph/battery.cpp
+++ b/Tools/AP_Periph/battery.cpp
@@ -62,6 +62,7 @@ void AP_Periph_FW::can_battery_update(void)
             pkt.state_of_health_pct = state_of_health_pct;
         }
 
+pkt.state_of_charge_pct = battery_lib.capacity_remaining_pct(percentage, i) ? percentage : UAVCAN_EQUIPMENT_POWER_BATTERYINFO_STATE_OF_CHARGE_UNKNOWN;
         uint8_t percentage = 0;
         if (battery_lib.capacity_remaining_pct(percentage, i)) {
             pkt.state_of_charge_pct = percentage;