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In addition, battery charge Discount Montblanc discharge qualities differ depending on battery chemistries. In general, battery energy capacity is a non-linear function of current draw. High current drains reduce battery energy capacity. Discount Omega are safety and regulatory requirements involved in battery type selection. Ever-more-stringent environmental regulations make the use of certain battery chemistries undesirable. Discount Panerai standards are also an issue in that they dictate protection against battery explosions and overheating leading to fires, as well limiting a battery chemistry's toxicity to the environment. Discount Patek Philippe course, it is important for wireless sensor nodes to operate for as long as possible without a battery change. One means to that end is by employing energy scavenging transducers that charge up the battery. (See "Sensors Get a New Role as Energy Scavengers," EE&T, July-Aug. 2010) The other way to maximize battery life is to simply turn off wireless sensor circuits when they aren't doing useful work.