ESP8266 Community Forum

- Tue May 12, 2015 3:16 am #17218 Hi

I'm hoping to use 2x 18650 3.7V (in parallel) and enable load share, i.e. if USB is plugged in, draw from USB - otherwise draw from battery. Does anyone know how load sharing in this setup could be accomplished?

Thanks

- Tue May 12, 2015 3:20 am #17219 Using something like these?

- Tue May 12, 2015 3:29 am #17220

Using something like these?

I've had a look at this one but I'm not quite sure what the output voltage is. Is it 3.7V?

In fact, would 3.7V need to be stepped down for the ESP?

Thanks!

- Tue May 12, 2015 5:04 am #17229

Hi

I'm hoping to use 2x 18650 3.7V (in parallel) and enable load share, i.e. if USB is plugged in, draw from USB - otherwise draw from battery. Does anyone know how load sharing in this setup could be accomplished?

Thanks

simplest way to do it is to add a small relay, energized when usb is plugged. relay contact will do the power selection switch. you can also add the 18650 charger from the link above, to charge your batt when
when usb is plugged.

but instead of relay, it be better if you use a mosfet to switch power from the batt. and transistor is cut offed when usb power is applied