diff --git a/widget/contrib/tp_smapi.lua b/widget/contrib/tp_smapi.lua
index e6da918..7192990 100644
--- a/widget/contrib/tp_smapi.lua
+++ b/widget/contrib/tp_smapi.lua
@@ -35,7 +35,7 @@ local function factory(apipath)
     end
 
     function tp_smapi.percentage(batid)
-        return tp_smapi.get("remaining_percent")
+        return tp_smapi.get(batid, "remaining_percent")
     end
 
     -- either running or charging time