SparkFun Electronics will be closed on November 26, 2020 and November 27, 2020 for the Thanksgiving holiday. We will begin normal operations at 9:00 AM Mountain Time on November 30, 2020.


Please see all COVID-19 updates here as some shipments may be delayed due to CDC safety and staffing guidelines. If you have an order or shipping question please refer to our Customer Support page. For technical questions please check out our Forums. Thank you for your continued support.


Member Since: January 21, 2011

Country: United States

  • If this battery is charged with an external charger as proposed in the notes, does the 'load' connector have to be disconnected? I'd like to have the battery persistently connected to the system I'm developing, but am unsure if this is safe to design since it will also need to be charged.

  • I have used this component previously and really like it a lot. In my current project, I'm trying to move to a lithium polymer battery, and would like to run at 3.3V. However, the reader requires 5V. Do I need to have a voltage amplifier in order to power this device from 3.3V? Or is there a simple strategy to do this?
    I guess alternatively I could run 2 cells in series to run a 5V system overall, but this introduces challenges in recharging the cells it seems.
    Thanks for any advice or recommendations!

  • I'm looking at this device, but would like to integrate it with an arduino board with usb connectivity. Once complete, users will need to connect the arduino to their computers via usb. So, I want to use a rechargeable li poly battery in the project, but I don't want multiple usb jacks (one for charging and one for communication).
    Does anyone have a strategy for how to integrate the charging with the connectivity?

No public wish lists :(