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TAU® - Always-charged power bank - Charcoal Black - Compact black TAU power bank with built-in charging cables and keyring attachment. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact black keyring power bank with CES Innovation Awards 2021 badge and dual output cables (Lightning and Micro USB). - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact black power bank with smooth matte finish and attached keyring holding three silver keys. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Black TAU® power bank with metallic hook, magnetic dock, and simple wall-mount installation components. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact charcoal black power bank with integrated dual charging cables and TAU logo on strap. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact agave green power bank with built-in USB-C, Lightning, and Micro USB cables held in hand outdoors. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact white power bank with integrated lightning and USB-C cables charging two smartphones outdoors. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact charcoal black power bank connected to a phone with a short charging cable. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact charcoal black power bank with metal keyring attached, held in hand against blurred background. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact white power bank with keyring attached, held by hand on white magnetic charger panel. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Charcoal black sleek power bank in minimalistic beige TAU branded box with sliding cover and two closed boxes nearby. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact agave green power bank with built-in cable and attached keyring with keys. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact agave green power bank keyring with lightning, micro USB, and USB-C output ports. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Agave green compact TAU power bank with attached metal keyring holding three keys. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact agave green power bank with integrated charging cables and matte finish. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact agave green power bank attached to keyring held against white shirt. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Agave green power bank with metallic hook and magnetic dock shown with installation steps. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - White compact power bank with rounded edges attached to a wall charger by a keyring magnetic connector. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact agave green TAU power bank with built-in charging cables held in hand outdoors. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact white TAU® power bank with retractable cable and keyring attachment showcasing sleek minimalist design. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact white power bank with magnetic charging and integrated keyring attachment in hand. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact white keyring power bank with dual USB outputs for Lightning and Micro USB charging. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact white power bank with built-in key holder and LED indicator light. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact white power bank with integrated flat charging cables and subtle TAU logo on front. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact white power bank with rounded edges attached to black backpack by carabiner clip alongside several keys. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - White magnetic dock for TAU power bank with metallic hook and easy wall installation components. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - White compact power bank with keyring attached, held by hand, mounted on white wall for magnetic charging. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact red portable power bank with attached USB cables and keyring with keys. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact black TAU power bank with built-in charging cables and keyring attachment. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact black keyring power bank with CES Innovation Awards 2021 badge and dual output cables (Lightning and Micro USB). - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact black power bank with smooth matte finish and attached keyring holding three silver keys. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Black TAU® power bank with metallic hook, magnetic dock, and simple wall-mount installation components. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact charcoal black power bank with integrated dual charging cables and TAU logo on strap. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact agave green power bank with built-in USB-C, Lightning, and Micro USB cables held in hand outdoors. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact white power bank with integrated lightning and USB-C cables charging two smartphones outdoors. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact charcoal black power bank connected to a phone with a short charging cable. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact charcoal black power bank with metal keyring attached, held in hand against blurred background. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact white power bank with keyring attached, held by hand on white magnetic charger panel. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Charcoal black sleek power bank in minimalistic beige TAU branded box with sliding cover and two closed boxes nearby. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact agave green power bank with built-in cable and attached keyring with keys. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact agave green power bank keyring with lightning, micro USB, and USB-C output ports. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Agave green compact TAU power bank with attached metal keyring holding three keys. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact agave green power bank with integrated charging cables and matte finish. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact agave green power bank attached to keyring held against white shirt. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Agave green power bank with metallic hook and magnetic dock shown with installation steps. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - White compact power bank with rounded edges attached to a wall charger by a keyring magnetic connector. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact agave green TAU power bank with built-in charging cables held in hand outdoors. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact white TAU® power bank with retractable cable and keyring attachment showcasing sleek minimalist design. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact white power bank with magnetic charging and integrated keyring attachment in hand. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact white keyring power bank with dual USB outputs for Lightning and Micro USB charging. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact white power bank with built-in key holder and LED indicator light. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact white power bank with integrated flat charging cables and subtle TAU logo on front. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact white power bank with rounded edges attached to black backpack by carabiner clip alongside several keys. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - White magnetic dock for TAU power bank with metallic hook and easy wall installation components. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - White compact power bank with keyring attached, held by hand, mounted on white wall for magnetic charging. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact red portable power bank with attached USB cables and keyring with keys. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact black TAU power bank with built-in charging cables and keyring attachment. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact black keyring power bank with CES Innovation Awards 2021 badge and dual output cables (Lightning and Micro USB). - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact black power bank with smooth matte finish and attached keyring holding three silver keys. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Black TAU® power bank with metallic hook, magnetic dock, and simple wall-mount installation components. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact charcoal black power bank with integrated dual charging cables and TAU logo on strap. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact agave green power bank with built-in USB-C, Lightning, and Micro USB cables held in hand outdoors. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact white power bank with integrated lightning and USB-C cables charging two smartphones outdoors. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact charcoal black power bank connected to a phone with a short charging cable. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact charcoal black power bank with metal keyring attached, held in hand against blurred background. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact white power bank with keyring attached, held by hand on white magnetic charger panel. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Charcoal black sleek power bank in minimalistic beige TAU branded box with sliding cover and two closed boxes nearby. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact agave green power bank with built-in cable and attached keyring with keys. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact agave green power bank keyring with lightning, micro USB, and USB-C output ports. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Agave green compact TAU power bank with attached metal keyring holding three keys. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact agave green power bank with integrated charging cables and matte finish. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact agave green power bank attached to keyring held against white shirt. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Agave green power bank with metallic hook and magnetic dock shown with installation steps. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - White compact power bank with rounded edges attached to a wall charger by a keyring magnetic connector. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact agave green TAU power bank with built-in charging cables held in hand outdoors. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact white TAU® power bank with retractable cable and keyring attachment showcasing sleek minimalist design. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact white power bank with magnetic charging and integrated keyring attachment in hand. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact white keyring power bank with dual USB outputs for Lightning and Micro USB charging. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact white power bank with built-in key holder and LED indicator light. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact white power bank with integrated flat charging cables and subtle TAU logo on front. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact white power bank with rounded edges attached to black backpack by carabiner clip alongside several keys. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - White magnetic dock for TAU power bank with metallic hook and easy wall installation components. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - White compact power bank with keyring attached, held by hand, mounted on white wall for magnetic charging. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact red portable power bank with attached USB cables and keyring with keys. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact black TAU power bank with built-in charging cables and keyring attachment. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact black keyring power bank with CES Innovation Awards 2021 badge and dual output cables (Lightning and Micro USB). - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact black power bank with smooth matte finish and attached keyring holding three silver keys. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Black TAU® power bank with metallic hook, magnetic dock, and simple wall-mount installation components. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact charcoal black power bank with integrated dual charging cables and TAU logo on strap. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact agave green power bank with built-in USB-C, Lightning, and Micro USB cables held in hand outdoors. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact white power bank with integrated lightning and USB-C cables charging two smartphones outdoors. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact charcoal black power bank connected to a phone with a short charging cable. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact charcoal black power bank with metal keyring attached, held in hand against blurred background. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact white power bank with keyring attached, held by hand on white magnetic charger panel. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Charcoal black sleek power bank in minimalistic beige TAU branded box with sliding cover and two closed boxes nearby. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact agave green power bank with built-in cable and attached keyring with keys. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact agave green power bank keyring with lightning, micro USB, and USB-C output ports. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Agave green compact TAU power bank with attached metal keyring holding three keys. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact agave green power bank with integrated charging cables and matte finish. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact agave green power bank attached to keyring held against white shirt. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Agave green power bank with metallic hook and magnetic dock shown with installation steps. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - White compact power bank with rounded edges attached to a wall charger by a keyring magnetic connector. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact agave green TAU power bank with built-in charging cables held in hand outdoors. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact white TAU® power bank with retractable cable and keyring attachment showcasing sleek minimalist design. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact white power bank with magnetic charging and integrated keyring attachment in hand. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact white keyring power bank with dual USB outputs for Lightning and Micro USB charging. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact white power bank with built-in key holder and LED indicator light. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact white power bank with integrated flat charging cables and subtle TAU logo on front. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact white power bank with rounded edges attached to black backpack by carabiner clip alongside several keys. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - White magnetic dock for TAU power bank with metallic hook and easy wall installation components. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - White compact power bank with keyring attached, held by hand, mounted on white wall for magnetic charging. - Rolling Square
TAU® - Always-charged power bank - Charcoal Black - Compact red portable power bank with attached USB cables and keyring with keys. - Rolling Square

TAU® - Always-charged power bank

$22.90
$29.90
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Color: Agave Green
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Designed in Switzerland

TAU 3in1 Power Bank is the world’s smallest power bank, designed to stay charged and ready on your keychain.

🔌 Universal Compatibility
Features a USB-C cable and a patented Lightning + Micro USB connector, compatible with virtually all portable devices.

🧲 Magnetic Dock
Charges automatically when placed on its dock, as seamlessly as hanging your keys.

🔋 Always Ready
Compact 3in1 design ensures your devices never run out of power on the go.

🪶 Ultra-Portable Build
Light, durable, and perfectly sized to fit on any keychain for daily carry.

TAU 3in1 Power Bank is the world’s smallest power bank, designed to stay charged and ready on your keychain.
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PRODUCT INFO


TAU® is the best 3in1 power bank, fitting the Lightning, Micro USB, and USB-C ports. It’s the smallest power bank in the world, so you can attach it to your key chain, and comfortably use it in your daily life. It’s the best portable power bank and alternative to your regular, heavy battery charger.

TAU® features a USB-C and our patented Lightning + Micro USB cable, and is compatible with virtually every portable device in the world. Thanks to its proprietary dock, charging it is as easy and seamless as hanging your keys once you get home.

Designed with love ❤️️ in Switzerland

    TECHNICAL SPECIFICATIONS

    Compatibility

    Lightning (iPhone, iPad, AirPods)
    USB-C devices
    Micro USB devices

    Technical

    Size 60x45x12mm / 2.32x1.77x0.47in
    Weight: 40g / 1.4oz
    Capacity 1400 mAh
    Holdable weight: 350gr / 12oz

    WHAT'S IN THE BOX

    TAU® Power bank

    TAU® Dock & Micro USB power cable
    Screws and wall plugs
    Nano suction double-sided layer
    User manual
    Eco-friendly packaging

    HOW TO USE
    REVIEWS
    AS SEEN ON
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    TAU® - Always-charged power bank
    $22.90 $29.90
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    Customer Reviews

    Based on 1117 reviews
    52%
    (580)
    32%
    (359)
    16%
    (176)
    0%
    (1)
    0%
    (1)
    A
    Alex Harper
    Convenient lifesaver

    Surprisingly small and light, totally forgot it was with my keys until my phone ran low. Clever integrated cables eliminate extra wires. The dock's magnet mounting felt odd at first, but quickly became super useful. Great portable backup, smart design overall.

    E
    Eric Bennett
    Happy with this power bank

    I am happy with this handy little charger.

    J
    James Harrison
    Compact and handy

    Got mine recently, pretty compact and convenient. Hoping the battery stays reliable.

    S
    Sam Cartwright
    Compact and handy for daily use

    Ordering was simple and arrived promptly with tracking details provided. The charger is impressively compact, fits on my keychain effortlessly and charges my phone quickly in emergencies. Had a small query about setup, and customer service replied swiftly and helpfully. Great purchase overall!

    123

    READ THE GUIDES

    From our editorial team — practical guides where this product fits in.

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    How Does a Portable Charger Work? Battery Tech, Circuits, and Capacity Explained

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    Keychain Power Banks in 2026: How They Work, What to Expect, and Which One to Carry

    Last updated: June 16, 2026 · By Rolling Square Team Dead battery. No cable. Your Uber arrives in three minutes. A keychain power bank is...

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    Hand lifting a keyring with keys and the Rolling Square AirNotch Pro Dual tracker from sofa cushions — How to Find Lost Keys guide cover
    BILINGUAL Jun 11, 2026

    How to Find Lost Keys Fast: 7 Proven Tips and the Best Key Tracker for 2026

    By Rolling Square Team · Updated 2026-06-11 Lost keys, locked doors, missed flights. The fastest way to find lost keys is to stop, retra...

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