switch problem

[robortwillys]

Hello everybody,
   
I am using a DC switch to power on a board.
It does not always work with a li-ion battery, but with a dc adapter I have no problem with the switch.
any help with this ?

[Hero999]

Then the problem is with the Li-ion battery.

Does it sometimes work, then suddenly stop working?

It's probably a loose connection. Try moving the wires around or tapping it to confirm this. Check all connections, resolder any bad joints and tighten any loose terminal screws.