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Black rectangular power bank with rounded edges and four ports visible on one end

MIRO

MIRO B8 27600mAh 140W Power Bank Black

SKU CH-6WA8-XEPMH

27600mAh 140W power bank with dual USB-C and dual USB-A ports charges four devices simultaneously

  • Compatible phone brandsApple
  • Compatible phone modelsiPhone 14 Pro Max
  • Battery chemistryLithium Polymer
  • Voltage5 V
  • Amperage3A
  • Measurements4.55 × 3.12 × 1.98 in
  • 27600mAh capacity powers laptops and phones for days
  • dual Type-C ports deliver 140W each for fast laptop charging
  • four devices charge simultaneously via two Type-C and two USB-A ports
  • 36Wh energy rating meets airline carry-on limits
  • 660g weight fits in a backpack without bulk

MIRO B8 27600mAh Power Bank

The MIRO B8 is a 27600mAh power bank delivering up to 140W from each of its two USB-C ports. It also provides two USB-A ports rated at 22.5W each. The lithium polymer unit weighs 660g and measures 4.55 by 3.12 by 1.98 inches in a black finish.

Suits travellers charging laptops.

Users who need to run four devices at once from a single brick will find the dual USB-C and dual USB-A layout practical. Buyers who want wireless charging or a lighter pack for phone-only top-ups should look at something else.

140W per USB-C port decides laptop compatibility

Each USB-C port can supply 140W maximum, so the power bank can charge most modern USB-C laptops at full speed. If a laptop requires more than 140W over a single port, this unit will not meet that demand.

How it compares

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

Price $55.99
Pricier than about 83% of the 1,307 comparable items (median $36.99).

Specifications

Product
Brand nameMIRO
Product lineB8
Model nameB8
Part numberB8
Product typePower Bank
Product colorBlack
Power
Battery chemistryLithium Polymer
Voltage5 V
Amperage3A
Size & build
Measurements4.55 × 3.12 × 1.98 in
Product weight660g
Compatibility
Compatible phone brandsApple
Compatible phone modelsiPhone 14 Pro Max

Questions about this item

How much space and weight does the 27600mAh B8 add to a backpack?

It measures 4.55×3.12×1.98 inches and weighs 660g, so it fits in most laptop sleeves without needing a dedicated mount.

Which port should I use first to get 140W output for my laptop, and what common mistake limits the speed?

Use either Type‑C port with a 140W‑rated USB‑C cable; the speed drops if you plug a second device or use a lower‑wattage cable.

When will the internal 99.36Wh lithium‑polymer battery need replacement?

Capacity fades gradually with each full cycle; expect noticeable runtime loss after several hundred cycles, at which point the unit is recycled.

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