Paco, the 1 minute wait on the 206 has nothing to do with the battery, it is a thermal restriction on the engine before you wind it up past idle to 70%. That impression has been floating around for years because it 'feels' right, but it is not the case.
In the 407, for example, the genererator is switched on at idle, and can be done immediately. However, if the ship has been shut down for more than 15 minutes you still have to wait the minute to wind it up.
Sorry to stray off topic.......