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2. Battery regenerator - Wikipedia

   en.wikipedia.org/wiki/Battery_regenerator

   Battery regenerator . When batteries are stored in an uncharged state for an extended period, lead-sulfur deposits form and harden on the lead plates inside the battery. This causes what is known as a "sulfated battery," which will no longer charge to its original capacity. Regenerators send pulses of electric current through the battery, which ...

3. Battery charger - Wikipedia

   en.wikipedia.org/wiki/Battery_charger

   An intelligent charger may monitor the battery's voltage, temperature or charge time to determine the optimum charge current or terminate charging. For Ni–Cd and Ni–MH batteries , the voltage of the battery increases slowly during the charging process, until the battery is fully charged.

4. Common external power supply - Wikipedia

   en.wikipedia.org/wiki/Common_external_power_supply

   USB battery charging: Battery Charging v1.2 Spec. and Adopters Agreement USB Implementers Forum, 2010-12-07. EU common External Power Supply: One Charger For All.eu Archived 25 September 2012 at the Wayback Machine, European Commission Enterprise and Industry Directorate – General

5. Uninterruptible power supply - Wikipedia

   en.wikipedia.org/wiki/Uninterruptible_power_supply

   If a battery has been completely discharged (e.g. the car lights were left on overnight) and next is given a fast charge for only a few minutes, then during the short charging time it develops only a charge near the interface. The battery voltage may rise to be close to the charger voltage so that the charging current decreases significantly.

6. Charge controller - Wikipedia

   en.wikipedia.org/wiki/Charge_controller

   A shunt charge controller or shunt regulator diverts excess electricity to an auxiliary or "shunt" load, such as an electric water heater, when batteries are full. [7] Simple charge controllers stop charging a battery when they exceed a set high voltage level, and re-enable charging when battery voltage drops back below that level.

7. AC adapter - Wikipedia

   en.wikipedia.org/wiki/AC_adapter

   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]