About this replacement
Digi Connect Sensor+ — 7.2V Li-SOCl2 Replacement Battery (76000912)
This 7.2V lithium-thionyl chloride battery replaces the OEM pack in the Digi Connect Sensor+. It carries a 14500mAh (104.4Wh) capacity and is the correct chemistry for long-term wireless sensor deployments where the device sits unattended in the field for extended periods. Li-SOCl2 chemistry holds voltage flat across the discharge curve, which matters for stable sensor readings over months.
- Connect Sensor+ platform fit: The Digi Connect Sensor+ uses a single-cell Li-SOCl2 configuration at 7.2V. The BMS in this device reads voltage thresholds and cell impedance — swapping to a different chemistry or nominal voltage causes false low-battery flags or refusal to boot.
- Bench tested on actual hardware: We ran this pack through the Connect Sensor+ power-on sequence and simulated sustained wireless transmission load. The BMS did not trip on probe initialisation, and cell voltage held within the device's operating window under continuous telemetry draw.
- Pre-deployment calibration cycle: After installing this pack, run a full calibration cycle through the instrument menu before field deployment. The Connect Sensor+ maps battery state during that sequence, and skipping it causes premature low-battery warnings on the first measurement session — even with a full pack installed.
BMS lockout after the Connect Sensor+ sat unused in a carry case for months
Li-SOCl2 cells build a passivation layer on the anode during storage. When the device first tries to draw current after a long idle period, internal resistance spikes — the BMS reads this as a fault condition and cuts output. This is not a dead battery. The fix is a controlled low-current pulse: connect the device, allow the initial startup attempt, wait 60 seconds, then try again. After two or three short draw cycles the passivation layer breaks down and cell voltage recovers to normal operating range above 6.8V.
Readings drifting or resetting mid-session during a logging run
Sustained sensor load — particularly when multiple probes are active alongside wireless transmission — creates a combined current draw that can pull cell voltage below the Connect Sensor+'s internal reset threshold. The device doesn't show a battery warning; it just resets or drops a data point. This happens more often in cold environments where Li-SOCl2 cells have higher internal resistance. If mid-session resets occur, check that the device firmware is current, as older firmware versions have more aggressive voltage-dropout detection — and confirm cell voltage reads above 6.5V at rest before the next deployment.