diff --git a/esphome/components/const/__init__.py b/esphome/components/const/__init__.py
index e93d508a3d8..eb999a05ff4 100644
--- a/esphome/components/const/__init__.py
+++ b/esphome/components/const/__init__.py
@@ -73,3 +73,4 @@ KEY_METADATA = "metadata"
 
 UNIT_AMPERE_HOUR = "Ah"
 UNIT_COUNTS = "#"
+UNIT_MILLIAMPERE_HOUR = "mAh"