Hi, I know that LiPo batteries requires attention, and that's my : I want to build an Arduino controlling LEDs by SMS, so the Arduino (pro mini) and the sim800 will be on mini box, can I simply put the battery with all of this? Or requires a certain distance from the other components?
Or requires a certain distance from the other components?
That depends on whether you plan to abuse the LiPo and cause it to start a fire AND if you care what the fire destroys.
My guess is that the loss of the Arduino and the sim800 would be the least of your worries.
If you operate the LiPo according to the rules there should be no problem. Your Arduino setup will not be as compact as a mobile phone and they seem to operate without problems.
It would obviously be sensible to install the Arduino / sim800 / LiPo in a location where it is unlikely to cause extensive damage if there is a problem.