# TSL 2128P

# TSL 2128P - Setup

### Battery Installation

<p class="callout info">Your reader may have shipped with the battery already installed.</p>

First, lift the yellow latch on the back of the reader, then slide the handle backwards to remove it:

[![(noshadow)](https://kb.simplerfid.com/uploads/images/gallery/2026-01/scaled-1680-/L3gscreenshot-2026-01-29-at-4-38-24-pm.png)](https://kb.simplerfid.com/uploads/images/gallery/2026-01/L3gscreenshot-2026-01-29-at-4-38-24-pm.png)[![(noshadow)](https://kb.simplerfid.com/uploads/images/gallery/2026-01/scaled-1680-/screenshot-2026-01-29-at-4-22-42-pm.png)](https://kb.simplerfid.com/uploads/images/gallery/2026-01/screenshot-2026-01-29-at-4-22-42-pm.png)

Then, remove the battery cover:

[![(noshadow)](https://kb.simplerfid.com/uploads/images/gallery/2026-01/scaled-1680-/screenshot-2026-01-29-at-4-27-08-pm.png)](https://kb.simplerfid.com/uploads/images/gallery/2026-01/screenshot-2026-01-29-at-4-27-08-pm.png)

Place the battery in the reader, lining up the pins with the contacts:

[![(noshadow)](https://kb.simplerfid.com/uploads/images/gallery/2026-01/scaled-1680-/screenshot-2026-01-29-at-4-28-12-pm.png)](https://kb.simplerfid.com/uploads/images/gallery/2026-01/screenshot-2026-01-29-at-4-28-12-pm.png)[![(noshadow)](https://kb.simplerfid.com/uploads/images/gallery/2026-01/scaled-1680-/screenshot-2026-01-29-at-4-28-39-pm.png)](https://kb.simplerfid.com/uploads/images/gallery/2026-01/screenshot-2026-01-29-at-4-28-39-pm.png)

Last, replace the battery cover and the handle:

[![(noshadow)](https://kb.simplerfid.com/uploads/images/gallery/2026-01/scaled-1680-/screenshot-2026-01-29-at-4-31-57-pm.png)](https://kb.simplerfid.com/uploads/images/gallery/2026-01/screenshot-2026-01-29-at-4-31-57-pm.png)[![(noshadow)](https://kb.simplerfid.com/uploads/images/gallery/2026-01/scaled-1680-/screenshot-2026-01-29-at-4-32-46-pm.png)](https://kb.simplerfid.com/uploads/images/gallery/2026-01/screenshot-2026-01-29-at-4-32-46-pm.png)

##### ****Next,**** [****pair your reader to your device****](https://kb.simplerfid.com/books/mobile-app/page/pair-bluetooth)****.****