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Two slim rectangular power banks, one black and one white, lying side by side

ViewSonic

ViewSonic AS-TPB21 2-Pack 10000mAh Power Bank Black+White

SKU CH-SYWE-3J6YK

Two slim 10000mAh lithium-polymer packs charge three devices at once via dual USB-A and USB-C ports

  • Total capacity10,000 mAh
  • Battery chemistryLithium polymer
  • Voltage3.7 V
  • Amperage2.4 A
  • Output typeUSB
  • InputUSB
  • Two power banks included so one stays at home and one travels with you
  • 10000 mAh capacity per unit keeps phones and tablets running longer
  • Three output ports charge phone, tablet and earbuds at the same time
  • USB-C port works for both recharging the bank and powering devices
  • Slim 0.79 in profile and 437 g weight slips into a pocket or bag

2-Pack 10000mAh Power Bank

This ViewSonic set delivers two slim lithium polymer units, each rated at 10000mAh and 3.7 volts. They are built for anyone who needs reliable backup for phones, tablets or earbuds while travelling, commuting or working remotely. The pair lets you keep one at home and one in a bag so a charge is always within reach.

Triple Output 2.4A Charging

Each bank offers dual USB-A ports and a bidirectional USB-C port, allowing three devices to charge simultaneously at up to 2.4 amps total. The 10000mAh capacity comfortably handles multiple phone top-ups or a tablet plus earbuds, but it will not sustain high-draw laptops for long. Auto shut-off and LED indicators protect cells and show remaining power.

Slim Pocket Format

At 7.09 in x 5.51 in x 0.79 in and 437 grams for the pair, the units slip into a pocket, purse or palm without bulk. Two USB-C cables and a single manual are included, so no extra accessories are required to start charging. The lightweight design frees up bag space for other essentials.

How it compares

Measured against everything we stock in Portable Chargers & Battery Packs, at today’s prices. Recalculated every night.

Price $22.99
Cheaper than about 87% of the 1,307 comparable items (median $36.99).

Specifications

Product
Brand nameViewSonic
Model nameAS-TPB21
Part numberAS-TPB21
Total capacity10,000 mAh
Product type10,000 mAh
Product colorBlack+White-1
Ports & slots
Output typeUSB
InputUSB
Power
Battery chemistryLithium polymer
Voltage3.7 V
Amperage2.4 A
Size & build
Measurements7.09 in × 5.51 in × 0.79 in
Product weight437 g

Questions about this item

Can I charge the power bank and my phone at the same time using the USB-C port?

Yes, the USB-C port is bidirectional so it can recharge the power bank and supply power to a connected device simultaneously.

How do I know the power bank is charging my device correctly?

The built-in LED indicator lights show the remaining capacity and charging status so you can confirm power is being delivered.

What cables are included and do I need anything extra for USB-C devices?

The box contains two power banks, two USB-C cables and a user manual; no additional cable is required for USB-C charging.

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