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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®

$22.90
$29.90
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Color: Agave Green
Charcoal Black
Pure White
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® est la meilleure batterie externe 3 en 1, compatible avec les ports Lightning, Micro USB et USB-C. C'est la plus petite batterie externe au monde, vous pouvez donc l'attacher à votre porte-clés et l'utiliser facilement au quotidien. Elle est la meilleure solution portable de recharge et une alternative à votre chargeur de batterie habituel et encombrant.

TAU® est équipée d'un câble USB-C ainsi que de notre câble breveté Lightning + Micro USB, et est compatible avec la plupart des appareils portables du monde. Grâce à sa station d'accueil propriétaire, la recharge est aussi simple et pratique que d'accrocher vos clés lorsque vous rentrez chez vous.

Conçu avec amour ❤️️ en Suisse

    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®
    $22.90 $29.90
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    Customer Reviews

    Based on 1118 reviews
    52%
    (580)
    32%
    (360)
    16%
    (176)
    0%
    (1)
    0%
    (1)
    J
    Jake Thomas
    Handy and compact solution

    Received my charger quickly, exactly as described. I attached it to my keys and now use it all the time. Definitely recommend this handy gadget.

    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.

    123

    READ THE GUIDES

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

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    Short answer: Rolling Square's inCharge keyring cables are multi-connector charging cables that replace up to six single-purpose cables i...

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    How a Portable Charger Works, explained by Rolling Square, featuring the TAU 2 keychain power bank
    BILINGUAL Jun 16, 2026

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

    Last updated: June 16, 2026 · By Rolling Square Team A portable charger (power bank) is a rechargeable battery pack with input/output por...

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