FIELD GUIDESource-led reference
Port & Cable

guide

Power banks: energy, port output and sharing are different

Compare stored energy in Wh and the exact port/profile for the task. A large mAh number or total-watt headline does not tell you a device's charging rate or number of recharges.

Applies to: Three exact Anker models, with unknown Wh retained where the inspected source does not state it. No product recommendation or travel-transport approval.

Units need their reference voltage

Wh = Ah × nominal battery voltage. Do not multiply a bank's cell-rated mAh by an arbitrary USB output voltage. Delivered USB energy is lower and depends on conversion, load, cable, temperature and cutoff. Without applicable measured efficiency, do not invent a recharge count.

Output and recharge paths have different limits

The bank can have separate input, individual output and total shared ratings. Pass-through operation is a separate exact-model condition, not an automatic feature of two USB-C ports.

Anker737 Power Bank PowerCore24K · Anker Prime20,000mAh Power Bank200W support · Anker Prime27,650mAh Power Bank250W

Worked documentary examples

Anker737 A1289 —24,000mAh /140W total

Documented outcome: Exact model energy/output comparison

  • C1 and C2 each list up-to28V5A as individual options; total output is140W, not140W per simultaneously used port. C1 recharges the bank. Wh is not established by the inspected product page.
  1. Read exact output port, profile and occupied-port case for the intended load.
  2. For >100W use the documented EPR source/cable/device path; neither capacity nor the USB-C outline establishes it.
  3. Do not promise pass-through charging or count battery recharges unless that exact model/mode is documented.
Anker737 Power Bank PowerCore24K

AnkerPrime A1336 —20,000mAh /200W total

Documented outcome: Exact model energy/output comparison

  • C1/C2 PD output up-to20V5A each; documented PPS3.3–11V3A is a different option. Up-to100W input is distinct from200W total output. Exact Wh and full occupied-port table still need label/manual confirmation.
  1. Read exact output port, profile and occupied-port case for the intended load.
  2. Do not promise pass-through charging or count battery recharges unless that exact model/mode is documented.
  3. 200W is aggregate output. Each documented USB-C output is capped at20V5A/100W; no single-port >100W/EPR capability is documented here for A1336. A task needing >100W on one port needs a different exact documented source/sink/cable path.
Anker Prime20,000mAh Power Bank200W support

AnkerPrime A1340 —27,650mAh /99.54Wh /250W total

Documented outcome: Exact model energy/output comparison

  • Manufacturer states99.54Wh; USB-C individual option up-to28V5A differs from250W total. Dual-input170W is conditional and not sustained throughout charging; do not turn it into guaranteed recharge time.
  1. Read exact output port, profile and occupied-port case for the intended load.
  2. For >100W use the documented EPR source/cable/device path; neither capacity nor the USB-C outline establishes it.
  3. Do not promise pass-through charging or count battery recharges unless that exact model/mode is documented.
Anker Prime27,650mAh Power Bank250W · Anker Prime27,650mAh250W — NZ product

Your next useful observation

Record bank model, Wh label, selected port/profile, cable and every other attached load.

Keep these limits

  • Wh for A1289/A1336 remains source-unconfirmed here; read their exact energy label before an energy comparison.
  • No battery energy/output/efficiency measurements or charge-time promises.
Source documents, revisions and inspection methods

Anker737 Power Bank PowerCore24K

Anker · A1289; live revision unavailable

Specifications: capacity; C1input; C1/C2output;140Wtotal

Inspected 2026-10-23 by public_page. Primary HTML page read directly in web reader; relevant body text and named table/section inspected. Not search-excerpt-only evidence. AI source review, no independent human review or hardware validation.

Exact bank outputs and capacity. No site charging test.

Read the original source

Anker Prime20,000mAh Power Bank200W support

Anker · A1336; live revision unavailable

Input/Output; PD/PPS; total output

Inspected 2026-10-23 by public_page. Primary HTML page read directly in web reader; relevant body text and named table/section inspected. Not search-excerpt-only evidence. AI source review, no independent human review or hardware validation.

Exact bank output profile; not a constant load or exact delivered energy.

Read the original source

Anker Prime27,650mAh Power Bank250W

Anker · A1340; live revision unavailable

Specifications: C1/C2input/output; total; dual-input note

Inspected 2026-10-23 by public_page. Primary HTML page read directly in web reader; relevant body text and named table/section inspected. Not search-excerpt-only evidence. AI source review, no independent human review or hardware validation.

Exact bank total vs per-port outputs and conditional input.

Read the original source

Anker Prime27,650mAh250W — NZ product

Anker · A1340; live revision unavailable

Small Size,HugePower →99.54Wh

Inspected 2026-10-23 by public_page. Primary Anker New Zealand HTML product page opened directly in web reader on 2026-10-23. Model A1340 and Key Features energy statement read; not search-excerpt-only evidence. AI source review, no independent human review or hardware validation.

Manufacturer energy label statement only; travel approval not adopted.

Read the original source

Source-documented education. Hardware behavior and independent human review have not been performed for these examples.

Draft a correction · More connection lessons