Wemos D1 Mini Lithium Battery Shield: Charging FAQ

Which boards does the shield fit?

Does the V1.3.0 shield work with the Wemos D1 mini Pro?

Yes. The supplied record lists compatibility with Wemos D1 mini Pro models and describes the shield as a way to power a WeMos mini or WeMos mini Pro from a single 3.7V lithium battery. That is the board fit the catalog confirms; it does not confirm fit for other ESP8266 boards or third-party clones.

Is this the same as a general-purpose LiPo charger?

No. It is a shield designed for the Wemos D1 mini family, with a built-in DC-DC converter that steps the 3.7V battery voltage up to 5V. Treat it as a board-specific power accessory, not a universal charger for any lithium cell.

How does charging work?

How do I recharge the battery?

When the battery runs low, plug the shield into a USB power source using a mini USB cable. The supplied instructions say the shield then automatically recharges the battery. The catalog does not provide a charge-time figure, so plan around the LED status rather than a fixed schedule.

What do the two LEDs mean?

The red LED lights while the battery is charging, and the green LED lights when charging is complete. Use the green light as your ready signal instead of guessing from elapsed time.

What is the J1 jumper for?

J1 sets the maximum charging current to either 0.5A or 1A. The catalog gives those two settings but does not recommend which to choose for a particular battery capacity or chemistry beyond 3.7V lithium. Check your battery's own documentation before changing the jumper.

Power output and the 5V limit

What voltage does the shield output to the board?

The built-in DC-DC converter steps the 3.7V battery voltage up to 5V. That 5V rail is what the shield supplies to the Wemos board.

What are the power limits?

The supplied record lists the Micro USB power supply as 5V with a maximum of 1A. It does not state a separate continuous output current rating for the boosted 5V rail, so do not assume the shield can drive high-current peripherals just because the input allows up to 1A.

Can I power motors or LED strips from this shield?

The catalog does not confirm that. The evidence covers charging a 3.7V lithium battery and stepping it up to 5V for the Wemos board. For current-hungry loads, check the load's requirements against the shield's documented limits rather than assuming headroom.

Pinout and the J2 jumper

What does J2 do?

J2 connects the battery to the A0 pin. The catalog lists that connection but does not explain the intended use, so treat it as a documented option to verify against your own board and code rather than a default you should enable.

Where can I find the full shield pinout?

The supplied record names the J1 and J2 jumpers and the micro USB input but does not include a complete pin-by-pin map. The catalog evidence is not sufficient to publish a full wemos d1 mini shield pinout, so confirm pin functions against the physical shield markings before wiring.

Catalog facts behind these answers

• Wemos D1 mini/Pro Shield Lithium Battery Charging Board V1.3.0: Wemos D1 mini Shield Lithium Battery Charging Board V1.3.0, compatible with Wemos D1 mini Pro models. This is the board-fit claim the answers above rely on; other boards are not confirmed.

  

• Wemos D1 mini/Pro Shield Lithium Battery Charging Board V1.3.0: Powers a WeMos mini or WeMos mini Pro from a single 3.7V lithium battery via a built-in DC-DC converter that steps up to 5V. Explains the battery chemistry and the 5V rail the board receives.
• Wemos D1 mini/Pro Shield Lithium Battery Charging Board V1.3.0: Micro USB power supply, 5V (max: 1A); J1 sets max charging current to 0.5A or 1A. Defines the input and charging-current choices; no separate output current rating is supplied.
• Wemos D1 mini/Pro Shield Lithium Battery Charging Board V1.3.0: Red LED lights when charging; green LED lights when charging is complete. Gives a concrete status check instead of an invented charge time.