NEW PRODUCT – USB/DC Lithium Polymer battery charger 5-12V – 4.2v. Charge your single-cell lithium ion/polymer battery any which way you like with this board. Have a USB connection? No problem, just plug into the miniUSB connector. Only have a wall adapter? Any standard 2.1mm DC adapter which puts out 5 to 12VDC will work fine. If both are plugged in, the charger will automatically choose whichever has the highest voltage.
Other nice things about this charger include multiple LEDs for power & charging status, including a charging LED which will blink when the battery is full. If the charger gets too hot from high-speed charging, it will slow down the charge rate automatically. You can easily adjust the charge rate up to 1.2A or down to 100mA.
Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.
Get the only spam-free daily newsletter about wearables, running a "maker business", electronic tips and more! Subscribe at AdafruitDaily.com !
1. "12v" in the automobile is typically 13.5v or occasionally as much as 14.5. Will this blow it up? I don’t know but don’t want to try.
2. It says 4.2v. I thought most LiPos used 3.7v. Perhaps this is just current or a typo, but I do worry without an explanation of the extra .5v.
tz, according to the datasheet the max max is 13.5V. There’s a protection diode that will drop about .3V so say the absolute max is 13.8V. If you think you’ll be plugging this into a Car, solder a 1n4001 inline on the positive wire to the charger and you’ll be safe up to 14.5V
lithium ion batteries have a nominal of 3.7v but when fully charged are 4.2v that is why you’ll see both/either numbers
Just a thought for later versions…rather than “Battery In” and “Battery Out” labels, something like “Battery” and “Load” might make for easier comprehension. Maybe it’s just lack of sleep, but I spent a good two minutes staring at the photo trying to sort out why a *charging* battery was attached to “in” rather than “out.” I get it now…but still, with my little walnut-size brain that can’t remember squat…when I order one of these, first thing I’ll be doing when it arrives is tape my own labels over it so I don’t forget.
Thx for the suggestion, we have a lot of PCBs made…but will consider it for the next round!