Connect PCB to Lead-Acid Battery + Sensors Integration (ESP32)

I need an embedded engineer to help safely connect a PCB to a lead-acid battery pack in series and integrate 4 external sensors (temperature, humidity, water presence, etc.). The system must read data in Arduino IDE and, if possible, send it to an existing telemetry endpoint (HTTP/MQTT).

Scope:

Safe wiring from battery pack to PCB

Best way to connect and mount sensors

Connector and grounding recommendations

Simple Arduino example to read sensors and output/send data


Experience with ESP32, Arduino, sensors, and battery-powered systems required.