diff --git a/pkg/decoder/tagsl/v1/decoder_test.go b/pkg/decoder/tagsl/v1/decoder_test.go
index d089d63..ae0e4be 100644
--- a/pkg/decoder/tagsl/v1/decoder_test.go
+++ b/pkg/decoder/tagsl/v1/decoder_test.go
@@ -173,7 +173,7 @@ func TestDecode(t *testing.T) {
 			},
 		},
 		{
-			payload:        "0000003c0000012c000151800078012c05dc02020100010200005460deadbeef",
+			payload:        "0000003c0000012c000151800078012c05dc02020100010200005460000a1000",
 			port:           4,
 			autoPadding:    false,
 			skipValidation: true,
@@ -191,6 +191,8 @@ func TestDecode(t *testing.T) {
 				HardwareVersionType:             1,
 				HardwareVersionRevision:         2,
 				BatteryKeepAliveMessageInterval: 21600,
+				BatchSize:                       10,
+				BufferSize:                      4096,
 			},
 		},
 		{
diff --git a/pkg/decoder/tagsl/v1/port4.go b/pkg/decoder/tagsl/v1/port4.go
index 646cddd..ba30357 100644
--- a/pkg/decoder/tagsl/v1/port4.go
+++ b/pkg/decoder/tagsl/v1/port4.go
@@ -27,8 +27,8 @@ type Port4Payload struct {
 	FirmwareVersionMinor            uint8  `json:"firmwareVersionMinor"`
 	FirmwareVersionPatch            uint8  `json:"firmwareVersionPatch"`
 	HardwareVersionType             uint8  `json:"hardwareVersionType"`
-	HardwareVersionRevision         uint8  `json:"hardwareVersionRevision" validate:"gte=300,lte=604800"`
-	BatteryKeepAliveMessageInterval uint32 `json:"batteryKeepAliveMessageInterval"`
+	HardwareVersionRevision         uint8  `json:"hardwareVersionRevision"`
+	BatteryKeepAliveMessageInterval uint32 `json:"batteryKeepAliveMessageInterval" validate:"gte=300,lte=604800"`
 	BatchSize                       uint16 `json:"batchSize" validate:"lte=50"`
 	BufferSize                      uint16 `json:"bufferSize" validate:"gte=128,lte=8128"`
 }