Laptop Batteries & AC Adapters

A laptop battery is the hardware component that powers the device when the computer has no direct connection to a power outlet. Rechargeable batteries enhance laptop portability. An efficient charger comes with an AC adapter that converts alternating current (AC) to direct current (DC). Batteries, chargers and AC adapters have unique features that heighten their performance. Newegg offers a variety of these products for different laptop brands.

Laptop Battery Technology Enhances Laptop Performance

Heavy-duty laptop batteries can power a specific device for several hours. The amount of time depends on usage and technology. Laptop networking tasks drain batteries more quickly. Nickel-Cadmium (NiCad), Nickel-Metal Hydride (NiMH) and Lithium-Ion (Li-ion) are the technologies employed by most batteries. Li-ion batteries have a long lifespan, and aren't affected by the memory drain. It makes them the most popular of the three battery options, and a popular choice for modern laptops. NiMH batteries have a long lifespan, as well.

Laptop Chargers Are a Key Extension to the Laptop

A device with a drained battery is of no help if the laptop charger is unavailable. This effectively makes the external power component one of the most important computer accessories. Issues with chargers are rare, although problems may arise from physical damage or excess voltage from the power outlet. Laptop batteries work best if charged with a compatible charger. Frequent travelers can use power adaptors for a simple recharge to access their laptop.

Laptop AC Adapters Protect the Computer's Components

Versatile Laptop AC adapters decrease the voltage from the main power supply. The motherboard uses the reduced voltage to keep laptop add-on cards and other laptop components safe. Each adapter has a specific voltage rating that should match the stated laptop voltage requirements.

Complete Laptop Chargers Are Long Lasting

A laptop charger has two components: the cable from the power outlet to the adapter, and the adapter with the cable that plugs into the device. The compatibility of either charger component to its counterpart ensures simple charging. The cable running from the adapter to the laptop plugs into the device via a connector tip. These vary for different brands of laptops, although cylindrical connectors are the most common. Some modern chargers for laptops employ the USB-C connector system technology that fits the charging port on the portable device. This new system carries significantly more power.

Keep Charging Sources Up to Date

Charging speeds depend on the AC adapter’s voltage rating, but the age of the battery also comes into play. A cylindrical module known as the ferrite bead lies just before the charger’s connector tip. It is an electromagnetic interference blocker that keeps other digital devices from disrupting normal laptop functions. A rubber shield covers the wiring for long-term use without issues. Most laptop chargers include a movable cord tie, which is convenient for wrapping the accessory and its cables for transport. The adhesive nature of these cord wraps keeps cables from slipping, and their durable material makes them last a long time.

Bestselling Laptop Batteries / AC Adapters Reviews:

Brian F.

4/19/2025 5:24:38 AM

Quick Shipping, works and as described Laptop Battery

“ Laptop Battery Worked and same as described by store. ”

Battery for Lenovo ThinkPad L421 L520 SL410 SL510 T410 T420 T430 T510 T520 W510 W520 Edge E420 E425 E520 E525 Laptops 42T4751 42T4753 42T4755 42T4757 42T4791 42T4793

ROGER S.

12/31/2024 5:59:37 PM

Good laptop replacement battery

“ much lower cost, than official OEM battery ”

NEW 42Wh 51KD7 Battery for Chromebook 11 3180 3189 5190 3181 2-in-1 Series

Aaron K.

5/26/2024 8:50:27 AM

Exotic Battery Cells Power Old Laptop

“ I previously bought a different battery (https://www.newegg.com/p/16J-02EN-06D12?Item=9SIB7VEJJE2957) to replace my original factory battery on my laptop. ”

CQCQ AA-PBTN4LR Compatible Battery Replacement for Samsung NP940X3M NP940X3M-K01US NP940X5M NP940X5N-X01US NP940X3M-K03US NP940X3M-K02US Laptop (15.4V 54Wh)

mbrasseau

4/18/2024 7:10:09 PM

It was the right one! And it works great!

“ This adapter was exactly the right one for my Dell Latitude e6420. ”

Laptop charger power supply adapter Dell Latitude E4200, E4300, E4310, E5250, E5270, E5400, E5410, E5420, E5430, E5440, E5450, E5500, E5510, E5520, E5530, E5540, E5550, E6220, E6230, E6320, E6330, E64

David A.

8/25/2022 8:44:25 PM

Product is as described

“ I later found out that her laptop's ac adapter was the problem. ”

New Dell Latitude E5440 E5540 6-cell 65Wh OEM Original Laptop Battery VV0NF

Gary A.