# Battery Specs

Let’s begin this guide with something very important. Before purchasing, upon arrival, and before connecting the battery, always confirm the red and black wire polarity. Incorrect polarity may damage your keyboard.

<figure><img src="https://310059516-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MipCDWiRJbsrF2klOWK%2Fuploads%2FGBarFpihQwsb98R3nV2x%2Ftoucan-card.png?alt=media&#x26;token=c86639ce-c9fb-48ae-a5c6-6dd3cb99397c" alt=""><figcaption></figcaption></figure>

Use a lithium polymer battery (3.7 V / 100–400 mAh) with a built-in protection circuit (PCM) and dimensions within 4.3 mm (thickness) × 36 mm (height) × 21 mm (width) (e.g., model numbers 401730, 402030, etc.), equipped with a Molex 51021-0200 (1.25 mm pitch) connector.

Model numbers indicate only the battery’s size. **Connector type** and **polarity** are not included in the model number, so make sure to confirm these separately before purchase. For example, some DTP 402030 batteries are compatible, but HXJNLDC 402030 are not, due to different polarity.

Before purchasing, always check:\
**① Size ② Connector ③ Polarity**

\
If you have any questions about battery compatibility, please send us a link or photo of the battery at <support@beekeeb.com>.

### Specifications

For using Toucan split keyboard in wireless mode, please prepare 2 batteries.

<table><thead><tr><th width="168.0625">Item</th><th>Details</th></tr></thead><tbody><tr><td>General</td><td>Lithium-polymer battery with a built-in protection circuit (PCM)</td></tr><tr><td>Voltage</td><td>3.7 V</td></tr><tr><td>Capacity</td><td>100–400 mAh</td></tr><tr><td>Connector</td><td><mark style="color:red;">Molex PicoBlade 51021-0200 (1.25 mm pitch)</mark> </td></tr><tr><td>Recommend Dimension</td><td><p>Within 21 mm (Width)  × 36 mm (Length) x 4.3 mm (Thickness)</p><p>for example, models 401730 or 402030</p></td></tr></tbody></table>

### Battery Testing Results

**⚠️ Keep sharp objects away from the battery.**\
Placing any sharp objects on top of the battery can puncture it, leading to damage or leaks. In the worst case, this sparks a fire hazard from chemical reactions inside.

#### ⭐️ Recommended Battery

* **401730**
  * Capacity: around 150mAh
  * Max Dimension: 17.5mm (Width) x 32mm (Length) x 4.3mm (Thickness)

<div align="left"><figure><img src="https://310059516-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MipCDWiRJbsrF2klOWK%2Fuploads%2FtVa4SSGmKm4SLIlIRXmZ%2FIMG_9800.jpg?alt=media&#x26;token=4ae3c362-7dbc-4bba-9abf-3ba0aa347846" alt=""><figcaption><p>Pre-soldered</p></figcaption></figure> <figure><img src="https://310059516-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MipCDWiRJbsrF2klOWK%2Fuploads%2FZ2zNHXVvKAOW6sAzHrab%2FIMG_9808%202.jpg?alt=media&#x26;token=20a1bc07-72ed-4c36-9cb8-37291aabba76" alt=""><figcaption><p>DIY</p></figcaption></figure></div>

* **402030**
  * Capacity: around 200mAh
  * Max Dimension: 20.5mm (Width) x 32mm (Length) x 4.2mm (Thickness)

<figure><img src="https://310059516-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MipCDWiRJbsrF2klOWK%2Fuploads%2F2zDCs9GwVt0z1r7TMPiX%2FIMG_9809.jpg?alt=media&#x26;token=a701d8e1-4793-43a9-a30c-870697617284" alt=""><figcaption></figcaption></figure>

#### \[Not Recommended] Battery with a Larger Capacity

Larger capacity batteries with the Molex PicoBlade 51021-0200 (1.25 mm pitch) connector are available on the market. However, they require high level of skill to route the wires and position the battery correctly and safely. For this reason, we <mark style="color:red;">do not recommend using them</mark>.

* **402535**

  There is a FPC connector in the trackpad. After installing the battery, please gently push it aside to create space for properly storing the FPC connector.

  * Capacity: around 320mAh
  * Max Dimension: 25.5mm (Width) x 37mm (Length) x 4.3mm (Thickness)

<div><figure><img src="https://310059516-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MipCDWiRJbsrF2klOWK%2Fuploads%2FxhyMJRdF75XYkAa8zhwR%2F2.jpg?alt=media&#x26;token=a13af510-a43f-4d40-bec7-846ff2b15c60" alt=""><figcaption></figcaption></figure> <figure><img src="https://310059516-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MipCDWiRJbsrF2klOWK%2Fuploads%2F3jdNd27rkyogAGpyGooR%2F1.jpg?alt=media&#x26;token=38361a00-e427-4d45-bb8d-5062e1e2a326" alt=""><figcaption></figcaption></figure></div>

* **502035**

  While the keyboard case can accommodate a battery with 5.2mm thickness, the battery may swell over time due to normal aging and cycling. This expansion could press against keyboard components, potentially causing damage or safety hazards. Therefore, we <mark style="color:red;">do not recommend using it</mark>.

  * Capacity: around 300mAh
  * Max Dimension: 20.5mm (Width) x 37mm (Length) x <mark style="color:red;">5.2mm</mark> (Thickness)

<figure><img src="https://310059516-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MipCDWiRJbsrF2klOWK%2Fuploads%2F9nGcnB7X5cJiJlAPJdeq%2F4.jpg?alt=media&#x26;token=d991236f-d377-45c0-9ed2-74c5765e7445" alt=""><figcaption></figcaption></figure>

### Shops / Brands of the Battery

<mark style="color:red;">Disclaimer</mark>: We are not affiliated with any of the shops or brands mentioned below. These batteries were selected based solely on the specifications provided above. We have not tested these batteries ourselves. Customers are responsible for verifying compatibility, polarity, and safety before use to prevent injuries or damages.

If you are not sure if the battery is compatible with the Toucan keyboard, please send the link or photo of the battery to <support@beekeeb.com>. We can do an initial check.&#x20;

<table><thead><tr><th width="142.9921875">Country</th><th width="193.0078125">Model</th><th>Link</th></tr></thead><tbody><tr><td>Canada</td><td>EEMB Lithium Polymer Battery 3.7V 150mAh 401730</td><td><a href="https://www.amazon.ca/-/dp/B08215WQMQ/">https://www.amazon.ca/-/dp/B08215WQMQ/</a></td></tr><tr><td>Germany</td><td><del>3.7 V Lithium Polymer Battery 150 mAh 401730</del></td><td><a href="http://amazon.de/-/-/dp/B0F8LS846W/"><del>http://amazon.de/-/-/dp/B0F8LS846W/</del></a><br>Updated on January 10, 2026: The battery listed on the product page has been changed by the seller and is no longer compatible with the Toucan.</td></tr><tr><td>Germany</td><td>EEMB Lithium Polymer Battery 3.7V 150mAh 401730 Rechargeable Lipo Battery with Molex Connector</td><td><a href="https://www.amazon.de/-/en/Lithium-Polymer-Battery-Rechargeable-Connector/dp/B08HH2VLZ7">https://www.amazon.de/-/en/Lithium-Polymer-Battery-Rechargeable-Connector/dp/B08HH2VLZ7</a></td></tr><tr><td>Japan</td><td>EEMBリチウムポリマー電池3.7 V 150mAh 401730</td><td><a href="https://www.amazon.co.jp/-/-/dp/B08215WQMQ">https://www.amazon.co.jp/-/-/dp/B08215WQMQ</a></td></tr><tr><td>United Kingdom</td><td>EEMB Lithium Polymer battery 3.7V 150mAh 401730</td><td><a href="https://www.amazon.co.uk/-/dp/B08215WQMQ/">https://www.amazon.co.uk/-/dp/B08215WQMQ/</a></td></tr><tr><td>United Kingdom</td><td>3.7V 150mAh 401730 Lipo Lithium Polymer Battery with Molex Connector</td><td><a href="https://www.amazon.co.uk/-/dp/B0CF5BGVP6/">https://www.amazon.co.uk/-/dp/B0CF5BGVP6/</a></td></tr><tr><td>United States</td><td>EEMB Lithium Polymer Battery 3.7V 150mAh 401730</td><td><a href="https://www.amazon.com/-/dp/B08215WQMQ/">https://www.amazon.com/-/dp/B08215WQMQ/</a></td></tr><tr><td>United States</td><td><del>EEMB 3.7V Lithium ion Battery 150mAh 401730 Rechargeable 3.7 Volt Lipo Battery</del></td><td><a href="https://www.amazon.com/-/dp/B0C9QFHPL7"><del>https://www.amazon.com/-/dp/B0C9QFHPL7</del></a><br>Updated on January 26, 2026: The battery listed on the product page has been changed by the seller and is no longer compatible with the Toucan.</td></tr></tbody></table>

*Updated: January 26, 2026*

### Using Toucan Without Batteries

If you do not have a battery yet, you can still use the keyboard by connecting both halves with two USB-C cables to USB power sources.

### \[Not Recommended] Changing the Polarity

If you cannot obtain a battery with the correct size and polarity, but have one with the right size and wrong polarity, you may carefully swap the wires by unlocking the Molex connector using tweezers. Disconnect the wires, swap their positions, and reattach them securely.&#x20;

**⚠️**  However, we strongly do not recommend this, as improper handling can damage the battery, cause overheating, or even lead to fire.

<div><figure><img src="https://310059516-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MipCDWiRJbsrF2klOWK%2Fuploads%2FoCdSUme0xqmphrLd8677%2FIMG_4798.JPG?alt=media&#x26;token=c30225f4-bd63-4682-88ce-54369a459167" alt=""><figcaption></figcaption></figure> <figure><img src="https://310059516-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MipCDWiRJbsrF2klOWK%2Fuploads%2FH3nYbHhIW3YejGkliXrz%2FIMG_4799.JPG?alt=media&#x26;token=5bb564ed-5a4d-4507-adee-8c3446e1ec7e" alt=""><figcaption></figcaption></figure></div>