erchiu
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To be clear, does the PIC reset as soon as the battery load is applied or does it take a little time (i.e. for the battery to discharge below a certain voltage)?
Also what do you mean by 'reset' - does it actually reset and then start working again, or does it stop working altogether?
Also a schematic might be valuable to see what is happening when the supply is from the battery.
Susan
I don´t agree.Battery is unable to power both load and PIC at the same time. Have you measured the total current requirement of your circuit ?
I don´t agree.It's clearly the problem of current limit. When you applies load then it took all the current from battery and there's not much left for PIC Microcontroller.
Where do you know about:it's caused because of current peak. Some devices on start up draws instantaneous peak current, which caused their voltage to drop, for example SIM900 module.
***********when i press the start button, the relais connect the load to battery.
exactly in this moment the pic turn off and after it immediately it comes back on.
Yes, let´s try.I would recommend you to use a 2200uF or higher capacitor between your battery terminals, that will solve the issue.
No, I don´t.Don't take it personal
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