Qwiic Fuel Gauge - MAX17048

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Based on the MAX17048, the Qwiic Fuel Gauge is perfect for monitoring your single-cell LiPo. While the MAX17048 provides pack voltage, it really shines with its Statement of Charge (SOC). 3.83V is ok to know, but knowing your battery is at 73% capacity is considerably better.

This is not a 'take the LiPo voltage curve and hack it into little voltage pieces' type of IC. The MAX17048 has a sophisticated algorithm that constantly monitors the pack giving much more accurate readings than a simple ADC. We've also written a fully featured Arduino library making interfacing as easy as a lipo.getSOC() call away.


The SparkFun Qwiic Connect System is an ecosystem of I2C sensors, actuators, shields and cables that make prototyping faster and less prone to error. All Qwiic-enabled boards use a common 1mm pitch, 4-pin JST connector. This reduces the amount of required PCB space, and polarized connections mean you can’t hook it up wrong.


Experimental Product: SparkX products are rapidly produced to bring you the most cutting edge technology as it becomes available. These products are tested but come with no guarantees. Live technical support is not available for SparkX products. Head on over to our forum for support or to ask a question.

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  • Adding a charger to this would be awesome! I would be able to add a LiPo with monitoring to any project!

  • Hi! Does anyone know if this fuel-gauge IC works on battery cells up to 15 Ah? Kind regards.

  • Does anyone know offhand if this works with the charging circuit on the ESP32 thing plus? I would like to monitor the charge on the ESP32 Thing Plus.

    It appears that I would connect the battery on the battery-in side and the sys-out to the ESP32 thing plus. That means I would need to find a 2 wire JST cable to connect between the ESP32 Thing plus and the Qwiic Fuel Gauge - MAX 17048 with appropriate Qwiic cables for the data transmission.

  • SOC is State of Charge, not statement.

    I've been wanting to try out Maxim's ModelGauge technology & this makes it pretty easy to do!

  • I love the combination of features on this! Any suggestions on how to combine this with solar charging? EDIT: Looking at the schematic, I realize that this circuit is not measuring current, only battery voltage. Therefore, connecting any charging circuit to it would probably be as simple as connecting it to the battery in a normal manner.

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