RTC Battery Replacement on Forecr Carrier Boards

In this guide, we will apply a coin-cell battery on forecr carrier boards. First, we will desolder the super-capacitor component for RTC. Then, we will solder a coin-cell battery with a schottky diode.

Attention: This guide requires technical soldering skills and there is a risk to void warranty. If your products are under warranty, please contact us for warranty confirmation before starting this guide to not void your warranty. 

On forecr carrier boards, there are the same type of super-capacitors used on them. You can see each RTC super-cap component’s placement from DSBOARD-NX2, DSBOARD-XV2 & MILBOARD-XV below. In this tutorial, we used a DSBOARD-XV2.

As you can see to the next picture, the super-cap’s positive & negative pins can be easily found from the carrier board’s silkscreen after desoldering it.

The positive pin is the Jetson module’s “PMIC_BBAT” pin & the negative one is the ground pin.

In this step, we need a 3V battery (CR1225 type) & a schottky diode (40V-3A type, like this). To solder these components together, we will use a battery holder (like this). 

The correct connection schematic has given to the following picture (RTC(+) pin to schottky diode’s cathode pin, schottky diode’s anode pin to battery’s positive pin, battery’s negative pin to RTC(-) pin).

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