Chargers, batteries and power supplies are essential components of many electronic devices.

Chargers, batteries and power supplies are essential components of many electronic devices. They provide power, store energy and regulate voltage. But what are the differences and similarities between them?

Power Supplies
A power supply is a device that converts AC (alternating current) or DC (direct current) into low-voltage DC, which is then used to power an electronic device1. Power supplies can be built-in or external, depending on the design of the device. For example, a laptop has a built-in power supply that runs on AC from a wall outlet, while a smartphone has an external power supply that plugs into a USB port.

Power supplies are designed to provide a constant and stable flow of electricity, regardless of the load or input fluctuations. They have various features and specifications, such as output voltage, current, wattage, efficiency and protection circuits. Power supplies can be used with batteries, but they will not charge them; for that, you need a battery charger.

Battery Chargers
A battery charger is a device that charges a battery and then maintains its charge1. A battery charger does the opposite of a power supply; it takes low-voltage DC and charges a battery. Battery chargers can be standalone or integrated with the device, depending on the type and size of the battery. For example, a flashlight has an integrated battery charger that charges the battery when plugged into a wall outlet, while a drone has a standalone battery charger that connects to the battery separately.

Battery chargers are designed to optimize the charging process and prolong the battery life. They have various features and specifications, such as input voltage, output voltage, current, capacity, charging stages and safety mechanisms. Battery chargers can be used with power supplies, but they will not power the device; for that, you need a battery.

Batteries
A battery is a device that stores electrical energy in chemical form and converts it back to electrical energy when needed2. A battery consists of one or more cells that contain electrodes and electrolytes. When a load is connected to the battery terminals, a chemical reaction occurs that generates an electric current.

Batteries are classified by their chemistry, such as lead-acid, nickel-cadmium, lithium-ion and more. Each chemistry has its own advantages and disadvantages, such as capacity, voltage, weight, cost and environmental impact. Batteries are also classified by their size and shape, such as AA, AAA, C, D and more. Each size and shape has its own applications and compatibility.

Batteries are used to power various electronic devices, such as flashlights, cameras, drones and more. They can be recharged by battery chargers or replaced when depleted. Batteries have various features and specifications, such as voltage, current, capacity, discharge rate and cycle life.

Conclusion
Chargers, batteries and power supplies are interrelated but distinct devices that serve different purposes. Power supplies provide power to electronic devices from AC or DC sources. Battery chargers charge batteries from low-voltage DC sources. Batteries store energy in chemical form and provide power to electronic devices when needed.

Can you recommend me some online stores to buy laptop batteries？

I can recommend you some online stores to buy laptop batteries.

Batteryclub : This store offers a wide range of laptop batteries for various brands and models, with fast shipping and a one-year warranty.

Unabatteria: This online replacement laptop battery store, with more than 18000 types of laptop batteries compatible with more than 20000 laptop models. They also offer a 30-day money back guarantee and a 12-month warranty.