> **Source:** Core Electronics is an Australian maker-electronics retailer and manufacturer based in Newcastle, NSW, run by a team of makers and educators. We design and manufacture our own product lines (PiicoDev, CE originals) and are official retailers for iconic maker and industrial brands including Raspberry Pi, Arduino, Adafruit, SparkFun and DFRobot. Orders ship Australia-wide from our Newcastle warehouse. Prices are in AUD and include GST. Pricing, stock and dispatch on this page are generated from the store's live catalog. Full machine-readable index: https://core-electronics.com.au/llms.txt # Adafruit Pro Trinket LiIon/LiPoly Backpack Add-On **Type:** Product page · **SKU:** ADA2124 · **Brand:** [Adafruit](https://core-electronics.com.au/brands/adafruit-australia) **Page:** https://core-electronics.com.au/adafruit-pro-trinket-liion-lipoly-backpack-add-on.html ([markdown](https://core-electronics.com.au/adafruit-pro-trinket-liion-lipoly-backpack-add-on.html.md)) If you have a Pro Trinket you probably know it's the perfect little size for a portable project. This LiPoly backpack makes it really easy to do! Instead of wiring... ## Pricing - **Price:** $9.75 (inc GST) — $8.86 AUD, exc GST - **Quantity discounts:** 10+ $8.60 (exc GST) · 50+ $8.42 (exc GST) ## Availability & dispatch - In stock, ships same business day if ordered before 2PM (Australia/Sydney). - We can dispatch 2 today, and up to 55 more in 8–12 days. ## How to buy - **Build a cart:** compose `https://core-electronics.com.au/cart/link?items=ADA2124:1` (comma-separated SKU:qty pairs) and share the link. Opening it shows a confirmation page with live pricing and stock before anything is added to the cart. - **Verify the cart first:** fetch `https://core-electronics.com.au/cart/link/ADA2124:1.md` for live line prices (inc & exc GST, quantity discounts applied), stock and dispatch estimates, and totals. Append `/to/{AU-postcode}` (or `/to/{country-code}:{postcode}`) before `.md` for delivery options and prices to that destination. Unknown, retired, or out-of-stock SKUs are flagged. (Query form `cart/link.md?items=...` also works but some robots parsers refuse query strings here.) - **Checkout** is completed on-site and includes a captcha at the payment step. Share the cart link; checkout takes it from there. - **Search the catalogue:** `https://core-electronics.com.au/search/{query}.md` (URL-encode the query; pages 2-3 at `search/{query}/{page}.md`; `search.md?q=` also works) - **Payment methods, purchase orders, policies and contact details:** https://core-electronics.com.au/llms.txt ## Description If you have a Pro Trinket you probably know it's the perfect little size for a portable project. This LiPoly backpack makes it really easy to do! Instead of wiring 2 or 3 boards together to make a charging system, this little PCB sits on top of the Pro Trinket and allows a LiPoly/LiIon battery to plug in. When the Pro Trinket USB port is powered, the battery is recharged automatically. Unplug the USB port and the Pro Trinket will switch over to the rechargeable battery. Ideally, this backpack is for use with the 3.3V Pro Trinket, so that the battery voltage (3.7V-4.2V) will get regulated down to 3.3V on the Pro Trinket board. However, many times, you can run a 5V Pro Trinket + accessories off of the ~4V from the LiPoly battery with no problem. (Technically its overclocking but Adafruit have never seen that affect the Pro Trinket itself, AVRs are happy to overclock without complaint). Solder the backpack on with the extra long header so that it can still plug into a breadboard, or clip the long header leads short afterwards for a slim package. There are two LEDs - one red and one green. While charging, the red LED is lit. When the battery is fully charged and ready for use, the green LED turns on. Seriously, it could not get more easy. If you want to add an On/Off switch, They also made that really easy. The two 0.1" holes with a box around them are the battery output line. Carefully cut the trace between them with a hobby knife and [replace with two wires from a switch like this slide switch](https://core-electronics.com.au/breadboard-friendly-spdt-slide-switch.html), or [this pushbutton one](https://core-electronics.com.au/on-off-power-button-pushbutton-toggle-switch.html), for example. Charging is performed in three stages: first a preconditioning charge, then a constant-current fast charge and finally a constant-voltage trickle charge to keep the battery topped-up. The charge current is 100mA by default, so it will work with any size battery and USB port. If you want you can easily change it over to 500mA mode by soldering closed the jumper on the bottom, for when you'll only be charging batteries with 500mAh size or larger. **For use with Adafruit LiPoly/LiIon batteries only! Other batteries may have different voltage, chemistry, polarity or pinout.** - Comes assembled and tested - Uses the 5V input via Micro-B USB connector on the Pro Trinket - For charging single Lithium Ion/Lithium Polymer 3.7/4.2v batteries (not for older 3.6/4.1v cells) - 100mA charge current, adjustable to 500mA by soldering a jumper closed [Batteries](https://core-electronics.com.au/lithium-ion-polymer-battery-3-7v-1200mah.html) and Pro Trinket not included. **Note**: You may get an off-white or a black JST connector. It's normal for the the red and green LED's to be very faintly glowing when the battery is attached but not charging, there is 500uA reverse-leakage current from the schottkey diode from the battery that backpowers the charger chip. ## Technical Details **Details:** - Dimensions: 15mm x 17mm x 2mm / 0.6" x 0.7" x 0.08" - Height w/ JST: 7mm / 0.3" - Weight: 1.3g - [Datasheets, PCB files and Fritzing available in tutorial page](https://learn.adafruit.com/adafruit-pro-trinket-lipoly-slash-liion-backpack/downloads) ![](https://core-electronics.com.au/attachments/localcontent/rohs_icon_8216055e11.jpg) ## Images - [Product image 1](https://core-electronics.com.au/media/catalog/product/2/1/2124-07.jpg)