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A battery eliminator is an adapter intended to allow a device intended for battery operation, such as a radio, to be operated from an AC outlet. [10] All radios, except crystal sets, used inconvenient and messy vacuum tube batteries until the mid- to late-1920s. Battery eliminators that plugged into light sockets became very popular. [11]
A battery charger, recharger, or simply charger, [1] [2] is a device that stores energy in an electric battery by running current through it. The charging protocol—how much voltage and current, for how long and what to do when charging is complete—depends on the size and type of the battery being charged.
Compaq's main marketing message for the SLT range was its battery life, up to 3-hours minimum. [2] Compaq mentioned this feature in almost all of the SLT literature. Moreover, Compaq released an external battery charger to enable the business user to charge up multiple batteries.
Although the nominal voltage of a 12 V lead acid battery is 12 V DC, when the engine is running the car's battery charging system will bring the system voltage to 13.8 V DC or higher. [10] The possible range of battery voltages from 11–15 V DC must be taken into account by devices attached to the cigar lighter socket.
External power supply could send data about itself (power, current and voltage ratings) to the computer. For example, genuine Dell power source uses 1-Wire protocol to send data by third wire to the laptop. The laptop then refuses a non-matching adapter. [36] Some computers use a single-voltage 12 V power supply.
A major feature of the LTE Elite series was the integration of the AC adapter into the main body of the laptop. Instead of a connector for DC input, the laptop takes a standard "figure-8" connector for AC power. This eliminates the need for an external power brick and was the first time this approach had been done in a notebook-sized computer.