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.
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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!