Skip to content
Pickoryx

Anker Fusion A1637 vs Nano A1638: Which Fits Your Charging Routine?

Choose the Fusion A1637 if direct wall refilling would remove a separate adapter from your power-bank kit. Choose the Nano A1638 if you already carry a suitable USB-C supply and want more built-in cable reach. The choice is about refill equipment and phone placement, rather than a guaranteed charging-speed advantage.

Published by Pickoryx · Published 2026-10-10

Source checked 2026-10-10 21:09 UTC

Products compared

Pickoryx may earn a commission from qualifying purchases through the paid Amazon links on this page, at no added cost to you.

The buying question

Is it more useful to refill directly at a wall outlet or to have more built-in cable reach while charging a phone?

The Fusion integrates the AC refill plug; the Nano pairs external USB-C refilling with a longer retractable cable.

Quick verdict

When the recommendation changes
  • A wall adapter is already essential for your other devices, reducing the packing benefit of the Fusion.
  • Your intended phone position exceeds the Fusion cable reach, making the Nano more useful even if you must bring an adapter.

The differences that matter

Refill Equipment

Anker Fusion A1637 (USB-C cable)

Integrated AC plug can refill the bank directly from a suitable wall outlet; USB-C input is also listed.[1]

Anker Nano A1638 (retractable USB-C cable)

Refills through its USB-C cable or port. Anker recommends a 30W-or-higher USB Power Delivery adapter for optimal recharging; a charger and separate USB-C cable are not included.[2]

What this changes: Choose the Fusion if leaving out a separate wall adapter for refilling this bank is the priority. If you already carry a suitable USB-C supply, the Nano fits that existing refill routine. This does not establish that either will refill faster.[1, 2]

The better fit depends on your priorities

Cable Reach

Anker Fusion A1637 (USB-C cable)

Fixed built-in USB-C cable listed at 0.82 ft.[1]

Anker Nano A1638 (retractable USB-C cable)

Retractable USB-C cable listed at approximately 2.3 ft; Anker says the length is estimated and not marked on the product. A slight outward pull releases it to retract.[2]

What this changes: The Nano gives more built-in reach when the phone and bank need separate positions on a desk. The Fusion suits close-together placement. Decide the reach requirement independently of how you refill the bank; longer reach does not establish longer cable life.[1, 2]

The better fit depends on your priorities

Best for your routine

Leaving out a separate adapter specifically for refilling the bank

Best fit: Anker Fusion A1637 (USB-C cable)

Based on listed features, not comparative testing.

The Fusion carries its own AC plug. Count the benefit only if your other gear does not already require a separate adapter.

View Anker Fusion A1637 (USB-C cable) on AmazonPaid link

Keeping a phone apart from the bank on a desk

Best fit: Anker Nano A1638 (retractable USB-C cable)

Based on listed features, not comparative testing.

The Nano has more manufacturer-listed built-in cable reach. Check the actual placement and leave slack at both connectors.

View Anker Nano A1638 (retractable USB-C cable) on AmazonPaid link

Value and trade-offs

One or both observed offers have eligibility conditions, so no unrestricted price difference is shown.

If either costs more, pay for the convenience you will actually use: direct wall refill or longer retractable reach. Include any USB-C adapter you still need when comparing your total setup cost.

There is insufficient verified price history to recommend purchase timing. Check current price and availability for the exact USB-C variants.

Limitations

  • This comparison covers the black USB-C Fusion A1637, manufacturer SKU A1637111, not the Lightning-cable variant. Check the selected variant and current availability before ordering.
  • Manufacturer specifications do not establish sustained charging output, delivered energy, heat, cable-mechanism life or real-world pocket comfort. We did not test either bank.
  • The Nano’s advertised 45W is a maximum for compatible devices, not a universal or sustained charging rate. Device requirements and the selected connection matter.
  • The Fusion page mixes USB-C and Lightning information and contains inconsistent combined-output totals, so those totals are not used here.
  • A built-in USB-C connector does not establish compatibility with every phone, laptop, host or travel situation. Check your device and destination requirements.

Questions shoppers ask

What if I want both direct wall refill and longer cable reach?

Neither built-in arrangement gives you both advantages in this comparison. Decide which compromise you prefer: the Fusion with a separate suitable cable for a farther-away phone, or the Nano with an external USB-C refill supply. Do not assume a separate cable is included.

Does the Nano need a separate cable just to recharge itself?

Its built-in USB-C cable can serve as an input, so it can connect directly to a suitable USB-C supply. A separate cable is an alternative through the USB-C port; the supply still has to come from elsewhere.

Methodology and sources

Compared manufacturer-documented refill inputs and built-in cable arrangements. Recommendations are conditional feature-fit judgments, not measured performance rankings.

AI assisted source research, drafting and editing. We did not perform hands-on testing.

View 2 sources
  1. 1.Anker Power Bank (10K, Fusion, Built-In Cable)Anker · Official specifications · Source checked 2026-10-10 20:51 UTC
    Evidence used on this page
    • Model Number A1637; Your 3-in-1 Power Solution; Total Input; embedded USB-C black SKU A1637111: Exact-model manufacturer facts about refill input and integrated cable configuration; promotional performance and durability claims are not adopted.
  2. 2.Anker Nano Power Bank (10K, 45W, Built-In Retractable USB-C Cable)Anker · Official specifications · Source checked 2026-10-10 20:52 UTC
    Evidence used on this page
    • Model Number A1638; Specifications Input; Using Anker InstaCord; Notes 2; charger/cable inclusion note: Exact-model manufacturer facts about refill input and integrated cable configuration; promotional performance and durability claims are not adopted.

Continue comparing