diff --git a/errors.go b/errors.go
index 6c76562..be77876 100644
--- a/errors.go
+++ b/errors.go
@@ -21,7 +21,10 @@
 
 package battery
 
-import "fmt"
+import (
+	"fmt"
+	"strings"
+)
 
 // ErrNotFound variable represents battery not found error.
 //
@@ -118,16 +121,18 @@ func (p ErrPartial) noNil() bool {
 type Errors []error
 
 func (e Errors) Error() string {
-	s := "["
-	for _, err := range e {
+	var s strings.Builder
+	s.WriteString("[")
+	for idx, err := range e {
 		if err != nil {
-			s += err.Error() + " "
+			if idx >= 1 {
+				s.WriteString(" ")
+			}
+			s.WriteString(err.Error())
 		}
 	}
-	if len(s) > 1 {
-		s = s[:len(s)-1]
-	}
-	return s + "]"
+	s.WriteString("]")
+	return s.String()
 }
 
 func wrapError(err error) error {
diff --git a/errors_test.go b/errors_test.go
index 5e91638..f3db9d6 100644
--- a/errors_test.go
+++ b/errors_test.go
@@ -66,6 +66,7 @@ func TestErrors(t *testing.T) {
 		{Errors{ErrFatal{errors.New("t1")}}, "[Could not retrieve battery info: `t1`]"},
 		{Errors{ErrPartial{Full: errors.New("t2")}, ErrFatal{errors.New("t3")}}, "[{Full:t2} Could not retrieve battery info: `t3`]"},
 		{Errors{ErrPartial{Full: errors.New("t4")}, ErrPartial{Current: errors.New("t5")}}, "[{Full:t4} {Current:t5}]"},
+		{Errors{ErrFatal{errors.New("testing error")}, nil}, "[Could not retrieve battery info: `testing error`]"},
 	}
 
 	for i, c := range cases {
@@ -76,3 +77,21 @@ func TestErrors(t *testing.T) {
 		}
 	}
 }
+
+func BenchmarkErrors_Error(b *testing.B) {
+	e := getErrors()
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		_ = e.Error()
+	}
+}
+
+func getErrors() Errors {
+	return Errors([]error{
+		errors.New("1"),
+		errors.New("2"),
+		errors.New("3"),
+		errors.New("4"),
+		errors.New("5"),
+	})
+}