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Adafruit Pro Trinket LiIon/LiPoly Backpack Add-On

4.0 out of 5 stars 28 ratings

Price: $10.78 Get Fast, Free Shipping with Amazon Prime & FREE Returns
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  • 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 and Pro Trinket not included.
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Frequently bought together

  • Adafruit Pro Trinket LiIon/LiPoly Backpack Add-On
  • +
  • Adafruit Pro Trinket 5V 16MHz (1 Piece)
  • +
  • Adafruit PowerBoost 1000 Charger - Rechargeable 5V Lipo USB Boost @ 1A - 1000C
Total price: $41.87
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Product 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 we've 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, we 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, or this pushbutton one, 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.

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4.0 out of 5 stars
4 out of 5
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Reviewed in the United States on October 14, 2018
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1.0 out of 5 stars Battery ports are reversed YOU WILL FRY THINGS PLEASE READ BEFORE YOUR BOARD SMOKES
By Guy on October 14, 2018
So adafruit did something really stupid and dirty here? Most li-po batteries have an attachment that makes sure you put the positive and negative ends in the right place but with this backpack they are backward. If you look up other lipo batteries in the micro size you find that the positive and negative sides are reversed to this things power inputs. But if they are batteries sold by adafruit they will be in this configuration. Now saying you haven't already fried this board already cause you can simply trade the wires around on your battery but that isn't something you should have to concern yourself with. I fried two boards and burnt a finger trying to pull to battery off a smoking board. There are standards ports and wiring for a reason design things to only work with your own products is a garbage way to conduct yourselves.
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Reviewed in the United States on April 8, 2019
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Reviewed in the United States on January 1, 2019
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Reviewed in the United States on January 5, 2019
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Reviewed in the United States on February 24, 2019
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Reviewed in the United States on August 22, 2018
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Reviewed in the United States on November 10, 2018
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Reviewed in the United States on February 11, 2020
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