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.For use with Adafruit LiPoly/LiIon batteries only! es assembled and testedUses the 5V input via Micro-B USB connector on the Pro TrinketFor 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 closedBatteries 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.Tactical BackpacksTactical Gear For MenTactical Survival GearTactical BagRuck I'VeBattleship BackpacksWebbing AllowsGregory BackpackTactics GearForwardBest ruck I've owned. I really like my Gregory backpack, but this holds more gear and is much more durable. Plus the MOLLE webbing allows for expansionReal BackpackDuty BackpackBackpack AwesomeMolle BackpackDrawstring PacksSimple DrawstringDaypack TutorialBackpack TutorialHandle AttachmentForwardEDC Forums tutorial on how to sew your own backpack Used & new (8) from $49.99 Check out premium laptop backpacks and bags from SwissGear, which provide portable convenience and added protection for people on the go. SwissGear SA1923 Black TSA Friendly ScanSmart Computer Backpack - Fits Most 15 Inch Laptops and Tablets

DetailsSwissGear Travel Gear ScanSmart Backpack 1900- eBags Exclusive FREE Shipping. See more technical details SwissGear SA1908 Black TSA Friendly ScanSmart Laptop Computer Backpack - Fits Most 17 Inch Laptops and Tablets (1908215)musto backpack laptop SwissGear SA3181 Black Computer Backpack - Fits Most 15 Inch Laptops and Tabletsbackpack keliling eropa Swiss Gear Swissgear 17" inch Laptop Notebook Mac Book iPad Outdoor ScanSmart Backpack - Premium High Quality - Blacklaptop rucksack 17 zoll dakine The versatile SwissGear SA1923 ScanSmart Laptop Backpack is made for convenience and functionality and is loaded with features. echo 770h backpack blower problems

Starting with ScanSmart technology, this backpack comes with a laptop-only computer compartment that is airport friendly, allowing you to keep most computers up to 15 inches in size safe when passing through security. backpack alienware m17xAt the TSA checkpoint, simply unfold to flat position and place the bag onto the X-ray belt. xbt backpackIt's as easy as that.gear rental te anau view larger view larger From the maker of the geniune Swiss Army Knife comes a durable backpack by SwissGear. This versatile backpack is made for convenience and functionality, and it's loaded with features like an easy access laptop compartment. This backpack also has a large packing capacity. The main pocket provides protected packing for multiple binders, gaming peripherals, and other accessories.

With this backpack, getting through airport security is quicker and easier. The laptop compartment opens quickly at the security checkpoint and the laptop window makes your computer visible while scanning. So, your computer stays say inside your bag while it's scanned. Other advanced features include contoured shoulder straps for enhanced comfort. The interior pocket organizer provides divider pockets for pens, pencils, cellphone, and anything else you need. There is even an elastic tab on the shoulder strap that keeps sunglasses secure and conveniently accessible. Key Features Large packing capacity to fit binders and anything else you needMP3 pocket so your music player is easy to find Computer compartment with unique quick-recognition window that makes going through airport security hassle-free Contoured shoulder straps provide extra comfort Sunglasses holder Durable fabric view larger 18 x 13 x 8.5 inches 3.1 pounds (View shipping rates and policies) This item must be shipped separately from other items in your order.

Additional shipping charges will not apply. #12 in Computers & Accessories > Laptop Accessories > Bags, Cases & Sleeves > Backpacks Product Warranty: For warranty information about this product, please 5 star69%4 star17%3 star6%2 star4%1 star4%See all verified purchase reviewsTop Customer ReviewsExtremely versatile|This backpack is awesome. Very happy with my purchase. I use this when travelling for work so I typically have my laptop, a notebook or two and all of my accessories/peripherals I need. Highly recommend this to any travelers that need something for similar situations.Edit: In my video I note that there's a buckling system "if you want to buckle this backpack around your waist" - however that is not the intended purpose of the buckles, nor will they work for buckling this backpack around your waist. To that end - I've never felt the need to buckle this backpack around my waist. It's a shorter backpack, and not like my bigger camera backpack or a hiking backpack, that you may be inclined to buckle around your waist.

My apologies for the misinformation in the video.Update: 7/26/2013 - Since my last update I've changed jobs, but this backpack is still getting just as much, if not more, use. I use it daily to and fro the office and it's holding up absolutely fine. It has shown no significant signs of wear. Update 11/13/2014 - Still putting this backpack to use on the daily. It's still in perfect condition. No loose threads, all materials have held up incredibly well. If and when this one starts to fall apart I'll have no issues buying the same bag, but at this rate it looks like it's going to be years down the road before that happens.Update 1/19/2015 - This backpack is $40 today. Ordering another one just to have on hand.Update 10/16/2015 - Coming to the realization that I should not have wasted $40 and bought an extra one of these to have on hand. The one I have isn't showing any signs of deterioration. I'll probably end up giving the extra one I bought to someone as a gift. Good backpack - Questionable Durability|