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Highest Capacity External Battery

External batteries are devices that can be used to charge your mobile devices and gadgets when there is no other source of power available. They come in different shapes and sizes, with varying features and capabilities. Browse the top-ranked list of highest capacity external batteries below along with associated reviews and opinions.

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  1. Energizer - MAX 20,000mAh 15W USB-C 3-Port Universal Portable Battery Charger/Power Bank w/ LCD screen for Smartphones & Accessories - Black

    SKU: J36C4YXKKH

    Energizer battery is great...This external battery is easy to use, holds a charge well, and charges my phone and laptop quickly when I need a boost away from a plug. ...Very good charger for the price,...

    Product Description

    A black portable power bank with 20,000mAh capacity, LCD screen, and three ports for simultaneous device charging.
    See all Portable Chargers & Power Banks
    Your price for this item is $29.99

  2. Anker - Power Bank (20,000mAh, 30W) - Black

    SKU: JJ858RCW9F

    Strong battery high capacity and fast charging these are good benefits...Very happy with this. They have 2 sizes/capacities and I asked the staff member at Best Buy to advice - I always get good advice...

    Product Description

    A compact black power bank with 20,000mAh capacity and 30W fast charging for universal device compatibility.
    See all Portable Chargers & Power Banks
    Your price for this item is $49.99

  3. Energizer - MAX 30,000mAh 15W USB-C 3-Port Universal Portable Battery Charger/Power Bank w/ LCD screen for Smartphones & Accessories - Black

    SKU: J36C4YXKZ3

    Wonderful battery - too slow to recharge...A fine battery pack. A little heavy, but considering its capacity, no surprise. ...Excellent power bank! High capacity & fast charger.

    Product Description

    A high-capacity black portable charger with LCD screen, three ports, and 15W USB-C fast charging.
    See all Portable Chargers & Power Banks
    Your price for this item is $39.99

  4. Energizer - Ultimate Lithium 20,000 mAh 20W USB-C PD & 15W Qi Wireless 4-Port Portable Battery Charger Power Bank with LCD Display - Black

    SKU: J36C4YXK5P

    Great battery life for battery packfggfddddxcfcfffcc...Big Battery for a World Traveler...This battery also charges up quickly so it is always ready.

    Product Description

    A black portable power bank offering 20,000mAh capacity, 20W USB-C PD, 15W Qi wireless charging, and LCD display.
    See all Portable Chargers & Power Banks
    Your price for this item is $49.99

  5. Energizer - Ultimate Lithium 30,000 mAh 30W Power Delivery 3-Port USB-C Universal Portable Battery Charger/Power Bank w/ LCD Display - Black

    SKU: J36C4YXKZ5

    Large capacity at a great price!...This charger is a karge capacity at a great price. It is versatile, fast, and lasting....Well worth it to keep this battery on hand...It actually isn't as heavy as I...

    Product Description

    A black portable power bank with 30,000mAh capacity, 30W USB-C fast charging, and LCD display.
    See all Portable Chargers & Power Banks
    Your price for this item is $29.99
    Save $20
    The previous price was $49.99

  6. Energizer - Ultimate Lithium 50,000 mAh 30W Power Delivery 3-Port USB-C Universal Portable Battery Charger/Power Bank w/ LCD Display - Black

    SKU: J36C4YXK4S

    Product Description

    A high-capacity black power bank with 50,000mAh, 30W USB-C fast charging, and LCD display.
    See all Portable Chargers & Power Banks
    Your price for this item is $69.99

  7. Jackery - Battery Pack 1000 Plus (1264 Wh Capacity) - Black

    SKU: J3GWXZ2TCJ

    Product Description

    A robust black battery pack offering 1264 Wh capacity for reliable, extended off-grid or emergency power.
    See all Solar Generators & Power Banks
    Your price for this item is $399.99
    Save $49
    The previous price was $449.00

  8. Jackery - Battery Pack 5000 Plus (5040 Wh Capacity) - Black

    SKU: J3GWXZ249V

    Product Description

    A compact black portable power solution with 5040Wh capacity, durable LFP batteries, and smart safety features.
    See all Solar Generators & Power Banks
    Your price for this item is $1,999.00
    Save $1000
    The previous price was $2,999.99

  9. Jackery - Battery Pack 3600 Plus Expandable Capacity Add-On (3584 Wh Capacity) - Black

    SKU: J3GW9H6PR2

    Product Description

    A compact black expansion battery with 3584Wh capacity, durable LFP cells, smart protection, and UL certification.
    See all Solar Generators & Power Banks
    Your price for this item is $1,099.00
    Save $1000
    The previous price was $2,099.00

  10. SanDisk - 2TB External USB 3.2 Gen 2 Type C Portable SSD - Black

    SKU: JXJ62CRCK2

    Product Description

    A portable black SSD offering 2TB storage, USB-C connectivity, 800MB/s read speeds, and rugged durability.
    See all External SSDs
    Your price for this item is $299.99
    Save $180
    The previous price was $479.99
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In-store pricing may vary. Prices and offers are subject to change. © 2026 Best Buy. All rights reserved. BEST BUY, the BEST BUY logo, the tag design, and MY BEST BUY are trademarks of Best Buy and its affiliated companies.