Nine-volt battery batteries were formerly made in this size. They had higher capacity than the then-standard carbon-zinc types, a nominal voltage of 8.4 volts, and very stable voltage. Once used in photographic and measuring instruments or long-life applications, they are no longer manufactured as mercury is highly toxic and accumulates in the ecosystem, posing a risk to humans and wildlife. Most battery voltage testers and chargers that can also test nine-volt need another snap clip to hold the battery, while cylindrical batteries often share a holder that may be adjustable in size. Because of the proximity of the positive and negative terminals
Real and substantial connection Real and substantial connection In Canadian law, a real and substantial connection or the real and substantial connection test is a legal principle used to determine whether a subject matter falls within a jurisdiction. The phrase was first adopted in Canada in the Supreme Court of Canada decision of "Libman v. The Queen" (1985). It is used in several circumstances in matters of conflict of laws. The test is primarily used to determine whether a Canadian court will recognize a foreign judgment where there was service ex juris. Courts will usually recognize a judgment from a foreign province or nation