> For the complete documentation index, see [llms.txt](https://docs.rapt.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.rapt.io/equipment/rapt-pill-hydrometer-or-user-guide/pill-wireless-charger-upgrade-installation.md).

# Pill Wireless Charger Upgrade - Installation

Pill Hydrometer Wireless Charger Upgrade | Instruction Sheet

This new wireless charging upgrade enables you to charge the pill hydrometer without the need for open and closing the housing.

Upgrading to wireless charging is a significant upgrade to the pill hydrometer as it means the pill hydrometer doesn’t require repeated opening and closing and this has several advantages including:

1. It reduces the chance of damaging one of the two o-rings giving you a more reliable seal
2. It eliminates the chance that the housing is done up to a different torque resulting in less accurate results
3. It make charging easier and more convenient
4. It minimises the need to recalibrate the RAPT Pill after charging as the housing does not need to be opened to charge the RAPT Pill

### Install Pill Hydrometer Wireless Charger Upgrade

### Video Guide

{% embed url="<https://youtu.be/Syl6ATpHqBc>" %}
Pill Wireless Charging Installation Guide
{% endembed %}

{% stepper %}
{% step %}

### Replace weights

Open the pill housing and remove the 5 gram weight from the bottom of the pill and replace it with the 3.5 gram weight. Repeat this process for the weight at the top of the board.&#x20;

<figure><img src="https://570278281-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FUqN4sW0x2s4yh6iiT8NN%2Fuploads%2FoHrQWazJzkKrvsrUqFyd%2FIMG_1904.JPG?alt=media&amp;token=050748c6-4305-4551-9b53-f50fd3c7a70c" alt=""><figcaption><p>Positioning of weights and spacers | Wireless Upgrade Kit</p></figcaption></figure>
{% endstep %}

{% step %}

### Attach wireless charging ring&#x20;

After the weights have been replaced, attach the two adhesive spacers to the weight at the bottom of the board. stick the wireless charging ring to the base of the pill.&#x20;

The order is: Weight: Solid piece: Half moon piece: Charging coil. The cutout of the half moon piece should align with the cutout of the board.

Ensure this is installed at the centre of the PCB board so it doesn’t get crushed when the pill housing is closed again.

<figure><img src="https://570278281-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FUqN4sW0x2s4yh6iiT8NN%2Fuploads%2FpDMKPhZP0f5DN6xElUsm%2FIMG_1906.png?alt=media&amp;token=571c0aea-48cf-4c95-a42c-7053fa21c4ff" alt=""><figcaption><p>Correct order for weight and spacers | Wireless Upgrade Kit</p></figcaption></figure>

Once installed, check that everything is aligned as in the image below.

<figure><img src="https://570278281-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FUqN4sW0x2s4yh6iiT8NN%2Fuploads%2FBdXkdhmqHeEzMEm53Lyr%2FIMG_1910.JPG?alt=media&amp;token=ec279e20-8892-4a5d-8e39-0228131fc9b3" alt=""><figcaption><p>Correctly Installed | Wireless Charging Kit</p></figcaption></figure>
{% endstep %}

{% step %}

### Plug in USB-C cord

Plug the USB type C cord into the Type C socket on the PCB board

<figure><img src="https://570278281-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FUqN4sW0x2s4yh6iiT8NN%2Fuploads%2FlU7ZsDfFiYviIPIimIse%2Fimage.png?alt=media&amp;token=d70f3cde-f1c2-4290-8079-2acd3a9c5d40" alt=""><figcaption><p>USB-C Socket | Wireless Charging Kit</p></figcaption></figure>
{% endstep %}

{% step %}

### Install Board into housing

Reinstall the 18650 Li-ion battery, ensuring correct polarity (if removed). Place the pill PCB board and charging coil into the housing ensuring the wireless charging coil sits in the centre of the housing as shown below.

<figure><img src="https://570278281-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FUqN4sW0x2s4yh6iiT8NN%2Fuploads%2F5cPMyxBlqmuF6JL6xgLe%2Fimage.png?alt=media&amp;token=1a2c50be-6094-42c5-b780-fd71da75489a" alt=""><figcaption></figcaption></figure>

Tighten the housing until the bottom o-ring is covered to ensure a hermetic seal is formed.
{% endstep %}

{% step %}

### Calibrate Pill

Close the housing back up and then perform Calibration process. We highly recommend using the Advanced (2-point) calibration process once the wireless charging coil has been put into the housing.

The easiest way to do this is right before a brew.

Simply put the pill into 20°C sanitiser solution and calibrate the first point at 1.000 gravity then put the pill into your unfermented wort and calibrate at the known starting gravity (use a second, calibrated hydrometer to complete this calibration process).

Refer to [**Calibration** ](/equipment/rapt-pill-hydrometer-or-user-guide/calibration.md)for a detailed guide.
{% endstep %}
{% endstepper %}