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Best Buy customers often prefer the following products when searching for 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. Anker - PowerCore III Elite 25600 mah 87W USB-C PD Portable Charger - Black - Front_Zoom
    Top comment

    "Excellent fast charging External battery....Quite the external battery. Charged my phone and laptop many times over while on a camping trip with now access to power. ...All around perfect external battery...This thing charges up fast, charges your devices fast, and has enormous capacity. What’s not to love about it?"

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    Product Description

    The Anker Advantage: Join the 55 million+ powered by our leading technology. Colossal Capacity: With a huge 25,600mAh cell capacity, you can keep multiple devices charged for days at a time (25,600mAh is the total of the nominal rated capacity of internal battery cells ). Charge an iPhone 11 Pro Max 4 times, an iPad mini 5 3 times, or a MacBook Air 2020 once. Unrivaled Charging Options: Equipped with dual USB-C ports for a powerful 87W charge to a single device, or simultaneous high-speed charging to 2 devices. With an additional 2 USB-A ports, you can even charge 4 devices at the same time at a combined output of 78W. Universal Compatibility: PowerCore is built using Anker’s exclusive PowerIQ technology to ensure flawless compatibility with virtually any mobile device.
    See all Portable Chargers & Power Banks
    Top comment

    "Excellent fast charging External battery....Quite the external battery. Charged my phone and laptop many times over while on a camping trip with now access to power. ...All around perfect external battery...This thing charges up fast, charges your devices fast, and has enormous capacity. What’s not to love about it?"

    See all customer reviews

    Product Description

    The Anker Advantage: Join the 55 million+ powered by our leading technology. Colossal Capacity: With a huge 25,600mAh cell capacity, you can keep multiple devices charged for days at a time (25,600mAh is the total of the nominal rated capacity of internal battery cells ). Charge an iPhone 11 Pro Max 4 times, an iPad mini 5 3 times, or a MacBook Air 2020 once. Unrivaled Charging Options: Equipped with dual USB-C ports for a powerful 87W charge to a single device, or simultaneous high-speed charging to 2 devices. With an additional 2 USB-A ports, you can even charge 4 devices at the same time at a combined output of 78W. Universal Compatibility: PowerCore is built using Anker’s exclusive PowerIQ technology to ensure flawless compatibility with virtually any mobile device.
    See all Portable Chargers & Power Banks
    See all Portable Chargers & Power Banks
  2. Energizer - MAX 10,000mAh 15W USB-C 3-Port Universal Portable Battery Charger/Power Bank w/ LCD screen for Smartphones & Accessories - Black - Front_Zoom
    Top comment

    "Not the highest capacity, but lighter, smaller, cheaper....Best upgrade from other external battery. Clean and smooth looking. Buy buy buy"

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    Product Description

    Charge your mobile devices quickly and efficiently with this Energizer power bank.  This portable charger provides 10,000mAh capacity to charge smartphones, tablets, smartwatches, headphones, ear buds, and more.  The bright LCD screen displays the current battery level so you always know how much power is left. The 10,000mAh battery provides up to 36 hours of additional power to smartphones while the two USB 2.1 Type-A ports with Rapid Charge technology deliver power consistently and efficiently to up to two devices at once at 10.5W. The USB-C output provides up to 15W of charging power.  Charge up to thee devices at once via two USB-A outputs and one USB-C output. The textured surface prevents slippage, scratches and fingerprints. Energizer PowerSafe Management protects against short circuit, overcurrent, overcharge and overdischarge for your power bank and devices. A USB-C Cable is included for recharging the power bank quickly and efficiently.
    See all Portable Chargers & Power Banks
    Top comment

    "Not the highest capacity, but lighter, smaller, cheaper....Best upgrade from other external battery. Clean and smooth looking. Buy buy buy"

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    Product Description

    Charge your mobile devices quickly and efficiently with this Energizer power bank.  This portable charger provides 10,000mAh capacity to charge smartphones, tablets, smartwatches, headphones, ear buds, and more.  The bright LCD screen displays the current battery level so you always know how much power is left. The 10,000mAh battery provides up to 36 hours of additional power to smartphones while the two USB 2.1 Type-A ports with Rapid Charge technology deliver power consistently and efficiently to up to two devices at once at 10.5W. The USB-C output provides up to 15W of charging power.  Charge up to thee devices at once via two USB-A outputs and one USB-C output. The textured surface prevents slippage, scratches and fingerprints. Energizer PowerSafe Management protects against short circuit, overcurrent, overcharge and overdischarge for your power bank and devices. A USB-C Cable is included for recharging the power bank quickly and efficiently.
    See all Portable Chargers & Power Banks
    See all Portable Chargers & Power Banks
  3. Anker PowerCore Select 10000mAh Dual USB Portable Charger External Battery Pack - Black - Front_Zoom
    Top comment

    "Great battery life. Fast charge and compact for easy travel."

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    Product Description

    Anker PowerCore Select 10000 Portable Charger - Black, One of The Smallest and Lightest 10000mAh Power Banks, Ultra-Compact, High-Speed Charging Technology Phone Charger for iPhone, Samsung and More. A revolution in high cell capacity portable charging. It fits easily into any pocket or bag, making it the perfect charger for on the couch, on a plane, or anywhere else your phone needs a boost. Dual charging ports with Anker's PowerIQ high-speed charging technology lets you charge two devices at the same time
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    Top comment

    "Great battery life. Fast charge and compact for easy travel."

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    Product Description

    Anker PowerCore Select 10000 Portable Charger - Black, One of The Smallest and Lightest 10000mAh Power Banks, Ultra-Compact, High-Speed Charging Technology Phone Charger for iPhone, Samsung and More. A revolution in high cell capacity portable charging. It fits easily into any pocket or bag, making it the perfect charger for on the couch, on a plane, or anywhere else your phone needs a boost. Dual charging ports with Anker's PowerIQ high-speed charging technology lets you charge two devices at the same time
    See all Portable Chargers & Power Banks
    See all Portable Chargers & Power Banks
  4. myCharge - AMP PRONG MAX 20,000mAh Everything Built-In Portable Charge for Most USB Enables Devices - Black - Front_Zoom
    Top comment

    "Lot of capacity, easy to charge. All outlest are USB-C. Works for me...Great external battery for travel...Charges quickly and battery lasts a long time. Great for travel including international travel (can be plugged into 110 or 220V outlets)"

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    Product Description

    Keep your mobile devices powered on the go with the myCharge AMP PRONG 20K portable power pack. The 20000mAh capacity powers up to two devices simultaneously. The myCharge AMP PRONG 20K portable power pack has USB-C port and a built-in USB-C cable that deliver up to 12W of output for rapid charging. The device has built-in wall prongs for rapid recharging of the powerbank
    See all Power Adapters
    Top comment

    "Lot of capacity, easy to charge. All outlest are USB-C. Works for me...Great external battery for travel...Charges quickly and battery lasts a long time. Great for travel including international travel (can be plugged into 110 or 220V outlets)"

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    Product Description

    Keep your mobile devices powered on the go with the myCharge AMP PRONG 20K portable power pack. The 20000mAh capacity powers up to two devices simultaneously. The myCharge AMP PRONG 20K portable power pack has USB-C port and a built-in USB-C cable that deliver up to 12W of output for rapid charging. The device has built-in wall prongs for rapid recharging of the powerbank
    See all Power Adapters
    See all Power Adapters
  5. myCharge - AMP PRONG PLUS 10,000mAh Everything Built-In Portable Charge for Most USB-C Enables Devices - Blue - Front_Zoom
    Top comment

    "Impressive external battery pack...I bought this product because I recently became a Amazon delivery driver and the device we are required to use constantly drains the battery immensely so I decided that I needed to buy an external battery pack so far this device has made my job 100% more efficient it charges Very fast And has really good battery life I love that it plugs into the wall!! ...Battery Charger...Excellent battery charger with built in adapter and works perfect for Android phones."

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    Product Description

    Keep your mobile devices powered on the go with the myCharge AMP PRONG 10K portable power pack. The 10000mAh capacity powers up to two devices simultaneously. The myCharge AMP PRONG 10K portable power pack has USB-C port and a built-in USB-C cable that deliver up to 12W of output for rapid charging. The device has built-in wall prongs for rapid recharging of the powerbank
    See all Power Adapters
    Top comment

    "Impressive external battery pack...I bought this product because I recently became a Amazon delivery driver and the device we are required to use constantly drains the battery immensely so I decided that I needed to buy an external battery pack so far this device has made my job 100% more efficient it charges Very fast And has really good battery life I love that it plugs into the wall!! ...Battery Charger...Excellent battery charger with built in adapter and works perfect for Android phones."

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    Product Description

    Keep your mobile devices powered on the go with the myCharge AMP PRONG 10K portable power pack. The 10000mAh capacity powers up to two devices simultaneously. The myCharge AMP PRONG 10K portable power pack has USB-C port and a built-in USB-C cable that deliver up to 12W of output for rapid charging. The device has built-in wall prongs for rapid recharging of the powerbank
    See all Power Adapters
    See all Power Adapters
  6. Energizer - Ultimate Lithium 20,000 mAh 20W USB-C PD & 15W Qi Wireless 4-Port Portable Battery Charger Power Bank with LCD Display - Black - Front_Zoom
    Top comment

    "Great battery...Has wireless charging for phone and fantastic capacity...Works great wired or wireless, also charges pretty quickly. Battery capacity is worth the price"

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    Product Description

    Charge your mobile devices with this Energizer power bank. This portable charger is a wireless Qi certified power bank that provides 20,000mAh capacity to charge smartphones, tablets, smartwatches, headphones, ear buds, and more. The Qi wireless fast charge supports up to 15W charging. Note that 10W for Apple, and 15W output for Samsung, Google Pixel, and other compatible devices should be expected. The 20,000mAh battery provides up to 72 hours of power. There are three outputs providomg 18W via a USB-A, 15W via the Wireless Qi charging mechanism, and 20W of power via the USB-C Power Delivery port. You can utilize all three ports at the same time for charging up to three devices at once. The 20W Power Delivery 3.0 USB-C allows you to fast charge certain iPhones from 0 to 50% in only 30 minutes with 20W of power. The 18W USB-A output supports fast charging for Samsung and other compatible Android devices allowing you to charge your compatible Android phone from 0-50% in only 30 minutes with 18W of power. The LCD screen displays current battery life and will show battery life as the unit charges as well. Energizer PowerSafe Management guarantees against short circuit, overcurrent, overcharge and overdischarge of your power bank and devices. A USB-C Cable is included for recharging the power bank or charging other devices.
    See all Portable Chargers & Power Banks
    Top comment

    "Great battery...Has wireless charging for phone and fantastic capacity...Works great wired or wireless, also charges pretty quickly. Battery capacity is worth the price"

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    Product Description

    Charge your mobile devices with this Energizer power bank. This portable charger is a wireless Qi certified power bank that provides 20,000mAh capacity to charge smartphones, tablets, smartwatches, headphones, ear buds, and more. The Qi wireless fast charge supports up to 15W charging. Note that 10W for Apple, and 15W output for Samsung, Google Pixel, and other compatible devices should be expected. The 20,000mAh battery provides up to 72 hours of power. There are three outputs providomg 18W via a USB-A, 15W via the Wireless Qi charging mechanism, and 20W of power via the USB-C Power Delivery port. You can utilize all three ports at the same time for charging up to three devices at once. The 20W Power Delivery 3.0 USB-C allows you to fast charge certain iPhones from 0 to 50% in only 30 minutes with 20W of power. The 18W USB-A output supports fast charging for Samsung and other compatible Android devices allowing you to charge your compatible Android phone from 0-50% in only 30 minutes with 18W of power. The LCD screen displays current battery life and will show battery life as the unit charges as well. Energizer PowerSafe Management guarantees against short circuit, overcurrent, overcharge and overdischarge of your power bank and devices. A USB-C Cable is included for recharging the power bank or charging other devices.
    See all Portable Chargers & Power Banks
    See all Portable Chargers & Power Banks
  7. Sharper Image - PowerBoost Pro Hot and Cold Compact - Black - Angle_Zoom
    Top comment

    "I use a lighter setting but my fiance needs it on the highest. The zip-case that it's stored in is perfect for on the go. ...The instructions note that the massager will lose battery if left unused, and if left unused it should be checked every 30 days to ensure that the battery is around 50% capacity. "

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    Product Description

    Sharper Image Powerboost Pro+ Compact delivers an unrivaled deep tissue massage experience, effectively targeting sore muscles and tension for outstanding sports recovery. Seamlessly alternate between soothing heat (115°F) and invigorating cold (38°F) with the groundbreaking dual-temperature attachment, and easily manage intensity levels using the user-friendly dial and bright LED display. The whisper-quiet brushless motor guarantees tranquil massage sessions without disturbances, while the compact, long-lasting design provides on-the-go relief with a 2-hour runtime per charge. Customize your massage with 4 unique attachments - Round, Hot + Cold, Fork, and Flat - and conveniently store the device and accessories in the provided carrying case. Transform your sports recovery routine with the Powerboost® Pro+ Compact today!
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    Top comment

    "I use a lighter setting but my fiance needs it on the highest. The zip-case that it's stored in is perfect for on the go. ...The instructions note that the massager will lose battery if left unused, and if left unused it should be checked every 30 days to ensure that the battery is around 50% capacity. "

    See all customer reviews

    Product Description

    Sharper Image Powerboost Pro+ Compact delivers an unrivaled deep tissue massage experience, effectively targeting sore muscles and tension for outstanding sports recovery. Seamlessly alternate between soothing heat (115°F) and invigorating cold (38°F) with the groundbreaking dual-temperature attachment, and easily manage intensity levels using the user-friendly dial and bright LED display. The whisper-quiet brushless motor guarantees tranquil massage sessions without disturbances, while the compact, long-lasting design provides on-the-go relief with a 2-hour runtime per charge. Customize your massage with 4 unique attachments - Round, Hot + Cold, Fork, and Flat - and conveniently store the device and accessories in the provided carrying case. Transform your sports recovery routine with the Powerboost® Pro+ Compact today!
    See all Percussive Massagers
    See all Percussive Massagers
  8. mophie - Powerstation PD (Fast Charge) 10,000 mAh Portable Charger for Most USB-Enabled Devices - Black - Front_Zoom
    Top comment

    "External phone charger...Product works fantastic, it charges at a very fast rate for its capacity and it holds power very well, was very useful when needed."

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    Product Description

    Charge three devices at once with the mophie powerstation 10K. It has a fast-charging USB-C PD port that puts out up to 20W as well as two USB-A ports. The compact powerstation has an internal 10,000mAh battery with the capacity to meet the demands of your day.
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    Top comment

    "External phone charger...Product works fantastic, it charges at a very fast rate for its capacity and it holds power very well, was very useful when needed."

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    Product Description

    Charge three devices at once with the mophie powerstation 10K. It has a fast-charging USB-C PD port that puts out up to 20W as well as two USB-A ports. The compact powerstation has an internal 10,000mAh battery with the capacity to meet the demands of your day.
    See all Portable Chargers & Power Banks
    See all Portable Chargers & Power Banks
  9. mophie - Powerstation XL PD (Fast Charge) 20,000 mAh Portable Charger for Most USB-Enabled Devices - Black - Front_Zoom
    Top comment

    "The battery level counter is glitched but the capacity is impressive....External battery charger"

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    Product Description

    The mophie powerstation XL provides fast, portable power for your digital devices. Its USB-C PD port puts out up to 20W of fast-charging power. It also has two USB-A ports, so you can charge three devices at once. The compact powerstation XL has an internal 20,000mAh battery with the capacity to meet the demands of your day.
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    Top comment

    "The battery level counter is glitched but the capacity is impressive....External battery charger"

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    Product Description

    The mophie powerstation XL provides fast, portable power for your digital devices. Its USB-C PD port puts out up to 20W of fast-charging power. It also has two USB-A ports, so you can charge three devices at once. The compact powerstation XL has an internal 20,000mAh battery with the capacity to meet the demands of your day.
    See all Portable Chargers & Power Banks
    See all Portable Chargers & Power Banks
  10. myCharge - Adventure H2O Turbo 10,050 mAh Portable Charger for Most USB Enabled Devices - Gray - Front_Zoom
    Top comment

    "External charger...Good size and battery capacity, good idea with side carabiner - makes it convenient to attach to belt loop in my case - comes handy"

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    Product Description

    Keep your mobile devices powered on the go with the myCharge Adventure H2O Turbo portable power pack. The 10050mAh capacity powers up to two devices simultaneously, while the rubberized design provides reliable durability. Dust proof, drop proof, and water proof, the myCharge Adventure H2O Turbo portable power pack has USB-A and USB-C ports that deliver up to 18W of output for rapid charging in a rugged, compact profile for maximum portability.
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    Top comment

    "External charger...Good size and battery capacity, good idea with side carabiner - makes it convenient to attach to belt loop in my case - comes handy"

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    Product Description

    Keep your mobile devices powered on the go with the myCharge Adventure H2O Turbo portable power pack. The 10050mAh capacity powers up to two devices simultaneously, while the rubberized design provides reliable durability. Dust proof, drop proof, and water proof, the myCharge Adventure H2O Turbo portable power pack has USB-A and USB-C ports that deliver up to 18W of output for rapid charging in a rugged, compact profile for maximum portability.
    See all Portable Chargers & Power Banks
    See all Portable Chargers & Power Banks
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