diff --git a/charger/wallbe.go b/charger/wallbe.go
index e927abad9..8b5a1f4dc 100644
--- a/charger/wallbe.go
+++ b/charger/wallbe.go
@@ -3,7 +3,6 @@ package charger
 import (
 	"encoding/binary"
 	"fmt"
-	"time"
 
 	"github.com/evcc-io/evcc/api"
 	"github.com/evcc-io/evcc/util"
@@ -165,20 +164,6 @@ func (wb *Wallbe) maxCurrentMillis(current float64) error {
 	return err
 }
 
-var _ api.ChargeTimer = (*Wallbe)(nil)
-
-// ChargingTime implements the api.ChargeTimer interface
-func (wb *Wallbe) ChargingTime() (time.Duration, error) {
-	b, err := wb.conn.ReadInputRegisters(wbRegChargeTime, 2)
-	if err != nil {
-		return 0, err
-	}
-
-	// 2 words, least significant word first
-	secs := uint64(b[1]) | uint64(b[0])<<8 | uint64(b[3])<<16 | uint64(b[2])<<24
-	return time.Duration(secs) * time.Second, nil
-}
-
 // currentPower implements the api.Meter interface
 func (wb *Wallbe) currentPower() (float64, error) {
 	b, err := wb.conn.ReadInputRegisters(wbRegPower, 2)
diff --git a/charger/wallbe_test.go b/charger/wallbe_test.go
deleted file mode 100644
index 496614e27..000000000
--- a/charger/wallbe_test.go
+++ /dev/null
@@ -1,50 +0,0 @@
-package charger
-
-import (
-	"testing"
-
-	"github.com/evcc-io/evcc/api"
-)
-
-func TestWallbeLegacy(t *testing.T) {
-	wbc, err := NewWallbeFromConfig(map[string]interface{}{"legacy": true})
-	if err != nil {
-		t.Error(err)
-	}
-
-	wb, ok := wbc.(*Wallbe)
-	if !ok {
-		t.Error("unexpected type")
-	}
-
-	if wb.factor != 1 {
-		t.Errorf("invalid factor: %d", wb.factor)
-	}
-
-	if _, ok = wbc.(api.ChargeTimer); !ok {
-		t.Error("missing charge timer api")
-	}
-
-	if _, ok = wbc.(api.Diagnosis); !ok {
-		t.Error("missing diagnosis api")
-	}
-}
-
-func TestWallbeEx(t *testing.T) {
-	wbc, err := NewWallbeFromConfig(map[string]interface{}{"legacy": false})
-	if err != nil {
-		t.Error(err)
-	}
-
-	if _, ok := wbc.(api.ChargerEx); !ok {
-		t.Error("missing ChargerEx api")
-	}
-
-	if _, ok := wbc.(api.ChargeTimer); !ok {
-		t.Error("missing ChargeTimer api")
-	}
-
-	if _, ok := wbc.(api.Diagnosis); !ok {
-		t.Error("missing Diagnosis api")
-	}
-}