Charge PNG Transparent Images

Submitted by on Aug 19, 2021

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battery charger, also known as a recharger, is a device that uses electricity to transform stored chemical energy into electrical energy for storage in an electrochemical cell.

The charging procedure (how much voltage or current to use for how long and what to do after it’s done) is determined by the size and kind of battery being charged. Some battery types have a high tolerance for overcharging (continued charging after the battery has been completely charged) and, depending on the battery type, can be recharged by connecting to a constant voltage or constant current source. At the end of the charging cycle, these simple chargers must be manually unplugged.

Other battery types utilize a timer to stop charging when it should be finished. Different battery types are prone to overcharging, damage (lower capacity, shorter lifespan), overheating and even exploding. Temperature or voltage sensor circuits and a microprocessor controller may be included in the charger to safely regulate charging current and voltage, detect the level of charge, and cut off at the end of charge.

To compensate for cable resistance, chargers may raise the output voltage proportionately to current.


A trickle charger delivers a tiny amount of electricity, just enough to prevent self-discharge in a battery sitting inactive for a long time. Trickle charging is not suitable for all battery types, and attempting to do so may result in harm. Indefinite trickle charging is not possible with lithium-ion batteries.

It may take many hours for a slow battery charger to finish a charge. High-rate chargers can recover most capacity considerably more quickly, but they may be too much for some battery types. To safeguard the battery from overcharging, such batteries require active monitoring. High-rate chargers are suitable for electric vehicles. Installation of such chargers and distribution assistance for them is a concern in the projected adoption of electric automobiles for public access.

Fast Charger

Control circuitry is used in fast chargers to quickly charge batteries without harming any of the cells in the battery. The control circuitry can be integrated inside the battery (usually for each cell) or the external charging device or divided between the two. The majority of these chargers have a cooling fan to keep the temperature of the batteries at a safe level. When used with regular NiMH cells that do not have specific control electronics, most fast chargers may also be used as standard overnight chargers.

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