diff --git a/lorahandler.go b/lorahandler.go
index ac7e531..3285f6f 100644
--- a/lorahandler.go
+++ b/lorahandler.go
@@ -480,8 +480,8 @@ func WriteDatapoint(mytime int64, deveui string, devaddr string, v uint8, h uint
 	if h > 0 {
 		sv := ""
 		if supercap {
-			// vp for supercapacitor (180 is 0%, 225 is 100%)
-			vp = int16((float32(v) - 180) / 45.0 * 100.0)
+			// vp for supercapacitor (165 is 0%, 210 is 100%)
+			vp = int16((float32(v) - 165) / 45.0 * 100.0)
 			if vp < 0 {
 				vp = 0
 			} else if vp > 100 {