Oh so adorable, this is the tiniest little lipo charger, so handy you can keep it any project box! Its also easy to use. Simply plug in the gold plated contacts into any USB port and a 3.7V/4.2V lithium polymer or lithium ion rechargeable battery into the JST plug on the other end. 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.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 back, for when you'll only be charging batteries with 500mAh size or larger.For use with Adafruit LiPoly/LiIon batteries only! Other batteries may have different voltage, chemistry, polarity or pinout.

Comes assembled and tested with a free bonus JST cable!

5V input via PCB-style USB connector

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

Free 2-pin JST cable included!

The MicroLipo charger can get hot during charging. Grab it by the sides and unplug then let cool before removing the battery - take care not to touch the components during charging!

Batteries not included.

Adafruit Micro Lipo - USB LiIon/LiPoly charger (18:22)

Oh so handy, this little lipo charger is so small and easy to use you can keep it on your desk or mount it easily into any project! Simply plug it via any MicroUSB cable into a USB port and a 3.7V/4.2V lithium polymer or lithium ion rechargeable battery into the JST plug on the other end. 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.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 front, for when you'll only be charging batteries with 500mAh size or larger.For use with Adafruit LiPoly/LiIon batteries only! Other batteries may have different voltage, chemistry, polarity or pinout.

Comes assembled and tested with a free bonus JST cable!

5V input via Micro-B USB connector

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 not included.

This is a special-purpose charger just for the rechargeable LIR2450 Lithium Ion coin cells. Slide the coin cell in the right way, and plug into any USB port to recharge - so easy! Takes about 3 hours to charge up, when its done, the green DONE LED will light up to let you know.Rechargeable coin cell is not included, but we have 'em in the shop hereCharging is performed in three stages: first a preconditioning charge, then a constant-current 45mA fast charge and finally a constant-voltage trickle charge to keep the battery topped-up.Only for use with rechargeable LIR2450 cells! Do not try to recharge non-rechargeable Lithium coin batteries! Do not charge unattended, do not charge damaged cells.

Lithium Ion Coin Cell Charger (16:34)

Is there anything an Arduino can’t do? Well, for one, most of them can’t be powered directly from a 3.7V LiPo battery; much less charge and monitor that battery. The SparkFun LiPower Shield takes care of this by combining the functionality of two of our favorite battery power boards: the Power Cell and the Fuel Gauge.

The LiPower Shield allows you to connect a 3.7V single cell Lithium polymer battery which it will boost up to 5V and connect to the Arduino board’s 5V pin. The on-board MAX17043G+U IC is connected to the I2C lines (A4 and A5) so that your project can monitor it’s own power supply. The configurable alert interrupt pin on the MAX17043G+U IC is broken out to D2 which will activate when the LiPo gets to 32% or lower.

The charging circuit is configured to charge the LiPo at 100mA but by adding a resistor to the supplied through-holes you can boost this to 500mA. There is a mini-USB port on the shield which allows you to charge the battery from a USB power source or you can supply a separate regulated 5V source on the “charge” header.