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Many newer cars no longer offer voltmeters or ammeters; instead, these vehicles typically have a light with the outline of an automotive battery on it. This can be somewhat misleading as it may be confused for an indicator of a bad battery when in reality it indicates a problem with the vehicle's charging system.
Low fuel/charge or re-fuel/re-charge – Appears when vehicle's fuel tank is nearing empty. Usually shaped like a gas dispenser, or a light next to "E" on the fuel gauge, and (most later cars) a buzzer. In an EV when the battery runs low, usually shaped with the EV charger symbol or the EV battery symbol and in most cases a buzzer or chime.
A typical 12 V, 40 Ah lead-acid car battery. An automotive battery, or car battery, is a rechargeable battery that is used to start a motor vehicle.. Its main purpose is to provide an electric current to the electric-powered starting motor, which in turn starts the chemically-powered internal combustion engine that actually propels the vehicle.
Nissan Leaf cutaway showing part of the battery in 2009. An electric vehicle battery is a rechargeable battery used to power the electric motors of a battery electric vehicle (BEV) or hybrid electric vehicle (HEV). They are typically lithium-ion batteries that are designed for high power-to-weight ratio and energy density.
A simple charger typically does not alter its output based on charging time or the charge on the battery. This simplicity means that a simple charger is inexpensive, but there are tradeoffs. Typically, a carefully designed simple charger takes longer to charge a battery because it is set to use a lower (i.e., safer) charging rate.
The actual voltage, matching the car battery's voltage, will be approximately 12.5 volts when dormant (less in cold conditions), approximately 14.5 volts when the engine and the alternator/generator are operating (more when cold), and may briefly drop as low as 5–6 volts during engine start due to the high temporary battery current usage. [12]
If the vehicle charging system is functional, leaving the engine running will restore the charge of the battery. Motorists may carry jumper cables and other equipment in case of accidental discharge of the vehicle battery (for example, by headlights, interior lights or ignition switch left on while the engine is not running).
Green Blog: A Second Life for the Electric Car Battery, The New York Times, 27 April 2011. Describes: ABB; Community Energy Storage for the use of electric vehicle batteries for grid energy storage. Woody, Todd. Green Blog: When It Comes to Car Batteries, Moore's Law Does Not Compute, The New York Times, 6 September 2010.
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