Smart Battery Sensor


This sensor continuously monitors (every 15min) the voltage and temperature of your batteries and warns you about any relevant action required to properly maintain the batteries to avoid damage due to sulfation and deep discharging. Whenever the voltage change larger than 100mV is detected, a message is sent to the cloud service and compared with the customer-specified thresholds for diverse alerting conditions (low/critical/charging/high temperature).

If the threshold are exceeded, an automated email/push messages are generated and delivered to multiple recipients specified by the customers or shared with the Proactive Boat Care providers (see below). The sensor will also inform you about the start and finish of the charging cycle, as well as monitor the battery temperature during the charging/discharging to avoid overheating (boiling) of the batteries. All measurements are stored in a cloud for further analysis and can be retrieved anytime by a provided mobile application.

The sensor monitors one battery bank (for example service batteries) supporting both 12V or 24V electrical networks.

SKU: S4B-G1-RC1-BAT Category:


After one year you can choose to continue using the Sense4Boat service for the price of 50€ per year.
Learn more about the Sense4Boat subscription here.

Smart Battery Sensor at a glance


Created specifically to withstand the harsh conditions in the engine room which include fumes, humidity and high temperatures.


Avoid damage due to sulfation and deep discharging and get notified whenever a low or critical voltage is detected.


Make sure your batteries do not overheat while charging. 


Monitor the charging process and make sure it is done properly.


The device communicates directly to the Sense4Boat control center through a specialised Sigfox IoT network. No SIM car or additional network costs are required.


Having its own replaceable batteries, this device does not use the boat’s power. Low energy consumption means you will need to replace the battery only every 5 to 7 years.

Prevent batteries from overheating

Battery voltage information is extremely important to determine the current situation and deciding at what point to start the charging. However, to ensure the safe charging of your battery, we also need the information of the battery temperature.

During the charging cycles, the batteries raise their temperature; only slightly with the healthy batteries, while with defective batteries in extreme cases it can come to the so-called “Battery boiling” and a potentially dangerous situation.

This is the exact reason, why our sensors are also equipped with a temperature reading, that detects each temperature change and alarms in case of potentially dangerous situations. By measuring the voltage and temperature of the battery, we can guarantee a safe battery charge at all times.

Increase the life expectancy of your batteries

Boat batteries are very expensive and usually last only for a couple of seasons. The main culprit for the pemanture battery death is the inproper maintenance; most of the battery producers specify a battery life of 7-10 years, however in the reality not many batteries live that long.

Maintaining marine batteries is very simple and can be summarized in just one sentence: the battery should be always stored in a fully charged state. If the battery is stored in partially discharged state,  a chemical process of deposition of lead sulfate crystals occurs on lead plates. We call this process sulfation and it is sulfation which is responsible for the most common irreversible battery capacity reduction. The longer the battery stays is in the discharged state, more crystals precipitate on lead plates, which then progressively shrinks battery capacity.

Technical Specifications

Dimensions 120 x 75 x 40 mm
Weight  160 g
Housing Super strong, high temperature resistant polycarbonate casing
IP rating IP68 rated housing ensures device can withstand fine dust, high-pressure spray,
submersion for 30 mins in 1m of water, and extreme temperatures.
Installation Compact and easy to install.
Multiple installation options for easily securing the device to assets with screws, adhesive tape, etc..
Operating temperature -20°C to +85°C
Diagnostic LED Diagnostic LED signifies operation status


User-Replaceable Batteries 2 x AA Lithium-Batterie 3,6V 2600mAh
Battery life Up to 5 years
Supported Battery Types AA Lithium-Batterie 3,6V 2600mAh
*Please dispose of Lithium batteries in a safe and responsible manner


Sigfox The smoke sensor communicates directly to the Sense4Boat control center through a specialised IoT network. No SIM car or additional network costs are required.