China has caused alarm among its neighbours and in Washington by erecting military installations on what were previously reefs and partially-submerged islets in the strategically-important waters. Delfin Lorenzana, Philippine defence secretary, said that Beijing had agreed “some time ago” that it was “not going to militarise those reclaimed islands”. Trump’s …

Batteries are preferably to be used under circumstances where there is no possibility for charging, and besides this, in fields where it is important to store energy given the smaller mass and volume. Military applications of batteries include radio appliances, lamps or most electricity powered devices and equipment.   Supercapacitors, …