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WeMos D1 Mini Lithium Battery Shield (HCWEMO0009)

Posted: Tue Nov 29, 2016 11:54 am
by admin
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The WeMos lithium battery shield provides a means of powering your WeMos mini, or WeMos mini Pro (see item HCWEMO0002) from a single cell (3.7V) lithium battery. The shield contains a DC-DC converter to step-up the batteries 3.7V to 5V supplying your WeMos mini and shields with up to 1A of power. When the battery is depleted simply plug the shield into a USB power source using a mini USB cable and it will automatically recharge the battery. Two LEDs on the shield indicate when the battery is charging and when charging has completed.



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Specification

Charging Voltage: 10V MAX 5V Recommended
Charging Current: 1A
Lithium Battery Voltage: 3.3-4.2V
Boost Power Supply: 5V (Max 1A)



Ports:

XH2-2.54mm (Port 1): Connect to lithium battery (3.3-4.2V)
Micro USB: Charging Port (5V)
Green LED: Illuminates when charging is complete
Red LED: Illuminates when charging is in progress
J1: Sets the maximum charging current: 0.5A or 1A




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Schematic:
HCWEMO0009_Schematic.pdf


Libraries, example code, and diagrams are provided as an additional free service by Hobby Components and are not sold as part of this product. We do no provide any guarantees or warranties as to their accuracy or fitness for purpose.

Descriptions and diagrams on this page are copyright Hobby Components Ltd and may not be reproduced without permission.

Re: WeMos D1 Mini Lithium Battery Shield (HCWEMO0009)

Posted: Sat Apr 29, 2017 9:54 pm
by gadjet
Hi,
Do you know if this acts like a backup battery so if I power the D1 from the USB connector it provides 5 V to the D1 and charges the connected battery at the same time and if I remove the USB power it still provides 5V to the D1 from the connected Battery?

Re: WeMos D1 Mini Lithium Battery Shield (HCWEMO0009)

Posted: Tue May 02, 2017 10:03 am
by andrew
Yes that is correct. Whilst the USB cable is connected both the battery will be charged, and 5V will be supplied to the 5V pin (~4.5V). If the USB cable is disconnected 5V will continue to be applied to the 5V pin (~5V) whilst the connected battery holds a charge.

Re: WeMos D1 Mini Lithium Battery Shield (HCWEMO0009)

Posted: Tue May 02, 2017 11:31 am
by gadjet
Thanks, just what I thought.

Re: WeMos D1 Mini Lithium Battery Shield (HCWEMO0009)

Posted: Fri Jan 24, 2020 4:24 pm
by wavedebb
Would it charge the battery from the 5v line if the usb was plugged into a D1 mini for instance?

Re: WeMos D1 Mini Lithium Battery Shield (HCWEMO0009)

Posted: Mon Jan 27, 2020 11:52 am
by andrew
Would it charge the battery from the 5v line if the usb was plugged into a D1 mini for instance?
No, I'm afraid to charge the battery it must be powered via the battery shields USB port.