Hi Ravi
I am working on a project where i need to power sim800l on AA batteries.
Requirement is run the product at -20 degree and there is no external power source or charging. So it need to run on primary cell. And i need a long backup too.
Considering all above design constrain i had selected 3 lithium AA battery and 1F super capacitor.
Any suggestions or advice would you like to give
Regards
Suman