I have a few Aeotec TriSensors as well as Aeotec MultiSensor 7 and they show battery level as on level. Not exactly unusable but kind of odd.
ZY026_1: ZY026_1 (4.7.1.0)Type:0x0102 Product:0x0005
by Z-Wave MfrID:0x0371
ZY020_1: ZY020_1 (4.7.1.0)Type:0x0102 Product:0x0018
by Z-Wave MfrID:0x0371