For individual battery block monitoring, sensors are used that can be connected directly to battery terminals or lugs. Each battery within a battery string or battery set must have a sensor. Alterantively, a battery health monitoring system may use current transformers and sensors to provide an overall state-of-health and measurement data. The sensors connect to their base monitoring unit using local WiFi, gateway or hardwired RJ45 connection and the base unit issues notification alerts via email, SMS text and SNMP.