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A self-contained jump box contains a battery and connects directly to the battery of the engine that needs a boost. Portable boosters may automatically sense the battery's polarity prior to sending power to the vehicle, eliminating the damage that can result from reversing the connection. [6]
Battery types such as the 9-volt have snap-on contacts. Battery holders for zinc-air batteries must not be completely air-tight since approximately 1 litre of air is required per ampere-hour of discharge per cell. The battery holder may include a valve integrated with the device power switch to allow air to be admitted when the device is ...
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The rechargeable lithium-ion battery plays up to 20 hours of continuous audio playback and up to 8 hours of video playback, the highest for any Creative digital audio player. Like its predecessor, decal stickers called "Stik-Ons" are sold separately to customize the look of the Neeon 2's frontplate, though they cannot be interchanged.
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Inside the casing is a small printed circuit board, which has some power circuitry and a small number of surface-mounted integrated circuits (ICs). [ citation needed ] Typically, one of these ICs provides an interface between the USB connector and the onboard memory, while the other is the flash memory .