From de9f559b50796b4938aec2159f4c320fac0e2987 Mon Sep 17 00:00:00 2001
From: Stephan Hadinger <stephan.hadinger@gmail.com>
Date: Fri, 30 Oct 2020 22:44:15 +0100
Subject: [PATCH] Zigbee fix TRADFRI battery percentage

---
 tasmota/xdrv_23_zigbee_5_converters.ino | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/tasmota/xdrv_23_zigbee_5_converters.ino b/tasmota/xdrv_23_zigbee_5_converters.ino
index c0a336c0e..ca6180ed3 100644
--- a/tasmota/xdrv_23_zigbee_5_converters.ino
+++ b/tasmota/xdrv_23_zigbee_5_converters.ino
@@ -1238,6 +1238,15 @@ void ZCLFrame::computeSyntheticAttributes(Z_attribute_list& attr_list) {
           attr_list.addAttribute(0x0001, 0x0021).setUInt(toPercentageCR2032(mv) * 2);
         }
         break;
+      case 0x00010021:       // BatteryPercentage
+        {
+          const char * model_c = zigbee_devices.getModelId(_srcaddr);  // null if unknown
+          String modelId((char*) model_c);
+          if (modelId.startsWith(F("TRADFRI"))) {
+            attr.setUInt(attr.getUInt() * 2);   // bug in TRADFRI battery, need to double the value
+          }
+        }
+        break;
       case 0x02010008:    // Pi Heating Demand - solve Eutotronic bug
         {
           const char * manufacturer_c = zigbee_devices.getManufacturerId(_srcaddr);  // null if unknown