Free Shipping

Free Returns*

1-Year Guarantee

High-capacity portable power bank with dual USB ports and USB-C input Kalsten

High-capacity portable power bank with dual USB ports and USB-C input Kalsten

Name: High-capacity portable power bank with dual USB ports and USB-C input Kalsten
Brand: Kalsten
Price: 46.99 USD
Availability: InStock

$46.99 $93.99 SAVE $47.00 (50% OFF)

3-Day Express Shipping

Easy 14-Day Returns

Support Mon–Fri

Color

White

Black

Size

20000mAh

Compact High-Capacity Portable Power Bank for All Devices

Keep your smartphone, tablet, wireless earbuds and other USB-powered devices charged on the go with the Kalsten portable power bank. Designed for everyday commuters, frequent travelers and anyone who needs reliable backup power, this Slim external battery delivers efficient multi-device charging while staying lightweight and pocket-friendly.

Key Features

Dual USB output ports and a USB-C input for flexible charging and recharging options
High-capacity lithium polymer cell engineered to deliver multiple full charges for smartphones and extended runtime for tablets
Smart charge technology automatically detects the connected device and optimizes current for safe and efficient charging
Multiple safety protections including overcharge, overcurrent, short-circuit and temperature control to protect both the power bank and your devices
Durable smooth-shell housing with rounded edges for comfortable grip and everyday durability
Compact, travel-friendly form factor that fits easily in purses, backpacks and carry-ons
Simple one-button operation and intuitive LED indicators to show remaining battery capacity and charging status

Why Choose Kalsten

Kalsten combines thoughtful engineering with premium components to deliver a portable charger that balances power, safety and portability. Whether you need reliable backup power during long commutes, business travel, outdoor adventures or emergency situations, this power bank gives you confidence that your essential devices will stay powered when it matters most.

Compatibility and Use Cases

Compatible with most smartphones, tablets, Bluetooth headphones, portable speakers, fitness trackers and USB-powered accessories
Ideal for travel, daily commuting, remote work, outdoor activities and emergency preparedness
Works seamlessly with popular charging cables and adapters for convenient setup

What's in the Box

The package includes the Kalsten portable power bank and a user guide. A charging cable and additional accessories may be included depending on the selected bundle.

Buy with Confidence

Backed by Kalsten quality standards, this portable power bank is built for dependable everyday use. Add reliable backup power to your gear and stay connected wherever you go.

Free standard shipping on all orders. No minimum purchase.

Ships to: United States
Processing: 1–4 business days (Mon–Fri)
Transit: 5–10 business days
Total delivery time: 6–14 business days
Order cut-off: 5:00 PM CET

You will receive a tracking number by email once your order ships. Please allow up to 48 hours for tracking to update.

See our full Shipping Policy.

You have 14 days from delivery to request a return.

Email support@open.shop with your order number to start a return.
Items must be unused, complete, and in their original packaging.
Return label: flat $9.99 USD, deducted from your refund — nothing to pay upfront.
Damaged, defective or incorrect items: we cover all return and replacement costs.
No restocking fees.
Exchanges: contact us and mention "exchange" — the new item ships once your return arrives.
Refunds are issued within 7 business days of inspection.

See our full Return Policy.

Questions about your order or our products? We're happy to help.

Open
Hooizolder 214
Drachten Friesland 9205CD
Netherlands

Email: support@open.shop

Customer Service:
Monday to Friday, 8:00 AM – 6:00 PM CET (excluding public holidays)

We reply to all messages within 24 hours on business days. Weekend messages are answered on Monday.

For quick answers, visit our FAQ page or use our Contact Form.

[{"id":52126901797185,"title":"White \/ 20000mAh","option1":"White","option2":"20000mAh","option3":null,"sku":null,"requires_shipping":true,"taxable":true,"featured_image":{"id":65885066461505,"product_id":10352514990401,"position":11,"created_at":"2026-08-25T06:57:30-04:00","updated_at":"2026-08-25T06:57:33-04:00","alt":null,"width":1200,"height":1200,"src":"\/\/open.shop\/cdn\/shop\/files\/O1CN01uyy5Kd1PVWHVMgRoN__2221241151846-0-cib.jpg?v=1787655453","variant_ids":[52126901797185]},"available":true,"name":"High-capacity portable power bank with dual USB ports and USB-C input Kalsten - White \/ 20000mAh","public_title":"White \/ 20000mAh","options":["White","20000mAh"],"price":4699,"weight":420,"compare_at_price":9399,"inventory_management":"shopify","barcode":null,"featured_media":{"alt":null,"id":56640494928193,"position":11,"preview_image":{"aspect_ratio":1.0,"height":1200,"width":1200,"src":"\/\/open.shop\/cdn\/shop\/files\/O1CN01uyy5Kd1PVWHVMgRoN__2221241151846-0-cib.jpg?v=1787655453"}},"requires_selling_plan":false,"selling_plan_allocations":[],"quantity_rule":{"min":1,"max":null,"increment":1}},{"id":52126901829953,"title":"Black \/ 20000mAh","option1":"Black","option2":"20000mAh","option3":null,"sku":null,"requires_shipping":true,"taxable":true,"featured_image":{"id":65885066494273,"product_id":10352514990401,"position":12,"created_at":"2026-08-25T06:57:30-04:00","updated_at":"2026-08-25T06:57:32-04:00","alt":null,"width":1182,"height":888,"src":"\/\/open.shop\/cdn\/shop\/files\/O1CN01Yuy0rx1PVWHV7jngs__2221241151846-0-cib.jpg?v=1787655452","variant_ids":[52126901829953]},"available":true,"name":"High-capacity portable power bank with dual USB ports and USB-C input Kalsten - Black \/ 20000mAh","public_title":"Black \/ 20000mAh","options":["Black","20000mAh"],"price":4699,"weight":420,"compare_at_price":9399,"inventory_management":"shopify","barcode":null,"featured_media":{"alt":null,"id":56640494960961,"position":12,"preview_image":{"aspect_ratio":1.331,"height":888,"width":1182,"src":"\/\/open.shop\/cdn\/shop\/files\/O1CN01Yuy0rx1PVWHV7jngs__2221241151846-0-cib.jpg?v=1787655452"}},"requires_selling_plan":false,"selling_plan_allocations":[],"quantity_rule":{"min":1,"max":null,"increment":1}}]

{"id":52126901797185,"title":"White \/ 20000mAh","option1":"White","option2":"20000mAh","option3":null,"sku":null,"requires_shipping":true,"taxable":true,"featured_image":{"id":65885066461505,"product_id":10352514990401,"position":11,"created_at":"2026-08-25T06:57:30-04:00","updated_at":"2026-08-25T06:57:33-04:00","alt":null,"width":1200,"height":1200,"src":"\/\/open.shop\/cdn\/shop\/files\/O1CN01uyy5Kd1PVWHVMgRoN__2221241151846-0-cib.jpg?v=1787655453","variant_ids":[52126901797185]},"available":true,"name":"High-capacity portable power bank with dual USB ports and USB-C input Kalsten - White \/ 20000mAh","public_title":"White \/ 20000mAh","options":["White","20000mAh"],"price":4699,"weight":420,"compare_at_price":9399,"inventory_management":"shopify","barcode":null,"featured_media":{"alt":null,"id":56640494928193,"position":11,"preview_image":{"aspect_ratio":1.0,"height":1200,"width":1200,"src":"\/\/open.shop\/cdn\/shop\/files\/O1CN01uyy5Kd1PVWHVMgRoN__2221241151846-0-cib.jpg?v=1787655453"}},"requires_selling_plan":false,"selling_plan_allocations":[],"quantity_rule":{"min":1,"max":null,"increment":1}}