diff --git a/src/lib/ebus/data.cpp b/src/lib/ebus/data.cpp
index 3fe38c2a..dcec3a80 100644
--- a/src/lib/ebus/data.cpp
+++ b/src/lib/ebus/data.cpp
@@ -51,7 +51,7 @@ static const dataType_t dataTypes[] = {
 	{"BTI", 24, bt_tim, BCD|REV|REQ,      0,          8,          8,    0}, // time in BCD, 00:00:00 - 23:59:59 (0x00,0x00,0x00 - 0x59,0x59,0x23)
 	{"HTI", 24, bt_tim,     REQ,          0,          8,          8,    0}, // time, 00:00:00 - 23:59:59 (0x00,0x00,0x00 - 0x17,0x3b,0x3b)
 	{"VTI", 24, bt_tim,     REV,       0x63,          8,          8,    0}, // time, 00:00:00 - 23:59:59 (0x00,0x00,0x00 - 0x3b,0x3b,0x17, replacement 0x63) [Vaillant type]
-	{"BTM", 16, bt_tim, BCD|REV,       0xff,          5,          5,    0}, // time in BCD, 00:00 - 23:59 (0x00,0x00 - 0x59,0x23, replacement 0xff) [Vaillant type]
+	{"BTM", 16, bt_tim, BCD|REV,       0xff,          5,          5,    0}, // time as hh:mm in BCD, 00:00 - 23:59 (0x00,0x00 - 0x59,0x23, replacement 0xff)
 	{"HTM", 16, bt_tim,     REQ,          0,          5,          5,    0}, // time as hh:mm, 00:00 - 23:59 (0x00,0x00 - 0x17,0x3b)
 	{"VTM", 16, bt_tim,     REV,       0xff,          5,          5,    0}, // time as hh:mm, 00:00 - 23:59 (0x00,0x00 - 0x3b,0x17, replacement 0xff) [Vaillant type]
 	{"TTM",  8, bt_tim,       0,       0x90,          5,          5,   10}, // truncated time (only multiple of 10 minutes), 00:00 - 24:00 (minutes div 10 + hour * 6 as integer)
diff --git a/src/lib/ebus/test/test_data.cpp b/src/lib/ebus/test/test_data.cpp
index c7668c95..dea37c40 100644
--- a/src/lib/ebus/test/test_data.cpp
+++ b/src/lib/ebus/test/test_data.cpp
@@ -105,6 +105,14 @@ int main()
 		{"x,,vti",   "21:04:58",  "10fe0700033a0415",   "00", ""},
 		{"x,,vti",   "-:-:-",     "10fe070003636363",   "00", ""},
 		{"x,,vti,2", "",          "",                   "",   "c"},
+		{"x,,btm", "21:04", "10fe0700020421", "00", ""},
+		{"x,,btm", "00:00", "10fe0700020000", "00", ""},
+		{"x,,btm", "23:59", "10fe0700025923", "00", ""},
+		{"x,,btm", "24:00", "10fe0700020024", "00", ""},
+		{"x,,btm", "-:-",   "10fe070002ffff", "00", ""},
+		{"x,,btm", "",      "10fe0700025924", "00", "rw"},
+		{"x,,btm", "24:01", "10fe0700020124", "00", "rw"},
+		{"x,,btm,2", "",    "",               "",   "c"},
 		{"x,,htm", "21:04", "10fe0700021504", "00", ""},
 		{"x,,htm", "00:00", "10fe0700020000", "00", ""},
 		{"x,,htm", "23:59", "10fe070002173b", "00", ""},