Backup Power for STMP157-OlinuXino Card

[Azriel]

Hi, please recommend an appropriate Battery or preferably supercapacitor to keep the card alive for a short period of main power outage of a few seconds

[LubOlimex]

The board has Li-Po battery connector. We have a lot of Li-Po batteries:

https://www.olimex.com/Products/Power/Lipo-battery/BATTERY-LIPO800mAh/

https://www.olimex.com/Products/Power/Lipo-battery/BATTERY-LIPO1400mAh/

[Azriel]

These are 3.7v batteries. The board is running on 5v. Does the on-board power management chip (AXP209?) make the appropriate conversion?
Also, the proposed batteries have a rather limitted operating temperature range. Are there other options?

[LubOlimex]

There is setup up convertor U10 MT3608 - it creates 5V from the Li-Po. Refer to the schematic.

I can't say about the batteries. There might be other options as long as they work in the same voltage range as Li-Po batteries and the battery can be attached properly to the connector (e.g. respecting + and -) - it should be fine.

[Azriel]

Thank you so much for your help.
I have eventually opted to go with the 3.6v Cornell Dubilier EDS155Z3R6 supercapacitor:(https://www.cde.com/resources/catalogs/EDS.pdf)
It has a charge capacity of 1.5 Farads which at 3.6v will provide 5.4 AmpSeconds. Seems like more than enough to allow the CPU pack-up its stuff together before power is lost.
I hope this will work Ok...

[LubOlimex]

I am not sure if the super capacitor would provide sufficient power for the board, not sure if it can be connected to the battery charger. Double check that, because if you want to connect it to the battery-charger it will get probably 4.2V or more which might be outside its range.