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Adafruit Pro Trinket LiIon/LiPoly Backpack Add-On

Brand: Adafruit

28 ratings

Price:

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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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This item:Adafruit Pro Trinket LiIon/LiPoly Backpack Add-On $10.78
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Adafruit Pro Trinket 5V 16MHz (1 Piece) $11.39
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Adafruit PowerBoost 1000 Charger - Rechargeable 5V Lipo USB Boost @ 1A - 1000C $19.70
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All Product Information Customer Q&A's Customer Reviews

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.

Product information

Technical Details

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Other Technical Details

Brand

Adafruit

Item model number

SG_B00SK697AU_US

Item Weight

0.81 ounces

Product Dimensions

4.72 x 3.35 x 0.39 inches

Item Dimensions LxWxH

4.72 x 3.35 x 0.39 inches

Color

Red, Green

Manufacturer

Adafruit Industries

ASIN

B00SK697AU

Is Discontinued By Manufacturer

Date First Available

September 22, 2014

Additional Information

Customer Reviews

28 ratings

4.0 out of 5 stars

Best Sellers Rank

#1,210 in Laptop Backpacks

Warranty & Support

Amazon.com Return Policy:You may return any new computer purchased from Amazon.com that is "dead on arrival," arrives in damaged condition, or is still in unopened boxes, for a full refund within 30 days of purchase. Amazon.com reserves the right to test "dead on arrival" returns and impose a customer fee equal to 15 percent of the product sales price if the customer misrepresents the condition of the product. Any returned computer that is damaged through customer misuse, is missing parts, or is in unsellable condition due to customer tampering will result in the customer being charged a higher restocking fee based on the condition of the product. Amazon.com will not accept returns of any desktop or notebook computer more than 30 days after you receive the shipment. New, used, and refurbished products purchased from Marketplace vendors are subject to the returns policy of the individual vendor.

Product Warranty: For warranty information about this product, please click here

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Customer reviews

5 star		56%
4 star		17%
3 star		12%
2 star		4%
1 star		11%

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Top reviews from the United States

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Guy

Battery ports are reversed YOU WILL FRY THINGS PLEASE READ BEFORE YOUR BOARD SMOKES

Reviewed in the United States on October 14, 2018

Verified Purchase

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.

10 people found this helpful

Helpful

Earthwormchris

They look like they work for an hour or so, then quit.

Reviewed in the United States on April 8, 2019

Verified Purchase

Ordered two units, Tested both on a brand new Adafruit battery (I did check the polarity before plugging both in.)
Both worked for about 2 hours a piece, then got warm stopped charging. Both LEDs glow slightly no matter what unless battery and power are disconnected.
A waste of 14 dollars and a potential fire hazard if left unattended.

2 people found this helpful

Helpful

Tucker, Joshua C

Good for all Lipo needs

Reviewed in the United States on January 1, 2019

Verified Purchase

Lady Ada always delivers and this product is no exception. My Nephew runs Cross Country for his High School's team and they practice in a heavily wooded area, so I fashioned him a GPS transponder and pedometer/timer using this and another Adafruit Logic controller and both perform very well in field conditions. I've never had a bad Adafruit product.

Helpful

Brady

Simple to hookup and works like it's supposed to

Reviewed in the United States on January 5, 2019

Verified Purchase

I used this board with a teensy 3.2, 18650 Li-ion, and a hundred or so speedy dotstar leds and honestly power was the easiest part of the project. The circuit with battery are embedded with only a micro-usb extension exposed and i haven't had any trouble recharging the battery or powering the pretty lights.

Helpful

Anthony_C

Great battery backup for breadboards !

Reviewed in the United States on February 24, 2019

Verified Purchase

Works as described !

One person found this helpful

Helpful

Steve Terry

Wouldn't charge my larger LiPo but I had forgotten to ...

Reviewed in the United States on August 22, 2018

Verified Purchase

Wouldn't charge my larger LiPo but I had forgotten to short the other side to allow over 100MaH batteries and had already soldered it down. LiPo also didn't seem to deliver enough current.

Helpful

denver kirsch

Don’t buy

Reviewed in the United States on November 10, 2018

Verified Purchase

It fried my board dispite being wired correctly

One person found this helpful

Helpful

Paul

Buy with confidence

Reviewed in the United States on February 11, 2020

Verified Purchase