We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Black rectangular power bank with digital display and four ports

NOBIS N2931 65W 20000mAh power bank

SKU CH-71NM-HZNFJ MPN N2931

A 20000mAh portable charger delivers 65W bidirectional fast charging through four ports with a digital display

  • Total capacity20,000 mAh
  • Battery chemistryLithium polymer
  • Voltage5 V
  • Amperage3 A
  • Measurements13.7 in × 7.0 in × 2.63 in
  • Product type20,000 mAh
  • Charges a laptop to 45% in 30 minutes with 65W bidirectional fast charging
  • Powers a smartphone 3-4 times and a laptop once using 20000mAh capacity
  • Charges four devices simultaneously via two USB-C and two USB-A ports
  • Digital display shows remaining power and low-current mode protects earbuds and smartwatches
  • Multi-layer safety protection guards against over-charge, over-discharge, over-voltage, over-current, short-circuit and temperature

65W 20000mAh power bank for mobile professionals

The NOBIS N2931 is a 20000mAh lithium polymer power bank rated at 65W maximum output and 45W maximum input. It targets users who need to charge laptops, phones, tablets and earbuds while away from mains power. The 400g unit measures 13.7 in x 7.0 in x 2.63 in. It is not for buyers who need higher wattage for larger laptops or more capacity for multi-day trips without recharging the bank itself.

Four ports and a digital display change daily use

Two USB-C ports and two USB-A ports allow four devices to charge simultaneously, with a low-current mode for small wearables. The integrated digital display shows remaining capacity so you can plan top-ups. Bidirectional fast charging refills the bank to full in 1.5 hours at 45W input, while a laptop reaches 45% in 30 minutes at 65W output. It lacks wireless charging and cables are not included.

65W PD output decides laptop compatibility

The single specification that determines suitability is the 65W Power Delivery maximum output. If your laptop charges at or below 65W over USB-C, this bank will power it; if the laptop requires more than 65W, it will not charge or will charge very slowly. The 20000mAh capacity and 5V 3A base rating support phones and tablets, but the 65W ceiling is the limiting factor for portable computers.

How it compares

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

Price $64.99
Pricier than about 90% of the 1,307 comparable items (median $36.99).

Specifications

Product
Brand nameNOBIS
Model nameN2931
Part numberN2931
Total capacity20,000 mAh
Product type20,000 mAh
Product colorBlack
Power
Battery chemistryLithium polymer
Voltage5 V
Amperage3 A
Size & build
Measurements13.7 in × 7.0 in × 2.63 in
Product weight400 g

Questions about this item

How often will the 20000mAh lithium-polymer battery need replacement?

The 20000mAh lithium-polymer cell is built for long daily use; replacement is only needed when capacity drops below your needs after many charge cycles.

What limits sustained 65W output before the bank throttles?

The internal temperature control activates under continuous high load, reducing output to protect the battery and connected devices.

How hot and loud does the N2931 get when charging a laptop all day?

The unit runs silently with no fan; warmth is normal during 65W output, and the multi-layer protection keeps temperatures within safe limits.

More in Portable Chargers & Battery Packs

Similar items