Compare two high-aggregate packs by documented energy, per-output limits and the setup behind their recharge peaks.
The decision in brief
How the options differ
Both advertise more total output than any single USB-C path: 300 W for EcoFlow and 250 W for Anker, each with a 140 W single USB-C maximum. EcoFlow documents 99.54 Wh; the reviewed Anker US source states no watt-hours. Their highest recharge figures depend on particular input setups.
By CompareFoundry · Published · Editorial review · Manufacturer documentation, not hands-on testing.
The buying guide
Package and specification details
Total output is not one-port output
EcoFlow lists 300 W across four USB-C outputs, with 140 W on the built-in cable and on C2, and 65 W on C3 and C4. Anker lists 250 W aggregate and 140 W per USB-C path. Neither total is available from one output, and adding single-output maxima overstates what several connected devices receive.
EcoFlow states 27,650 mAh and 99.54 Wh. Anker lists 27,650 mAh, but the retrieved US specification gives no watt-hour value, so the catalogue leaves it unknown rather than converting with an assumed cell voltage. Neither figure is delivered USB energy or a carrier approval.
EcoFlow's US page lists 320 W input and a 20-minute-to-80% claim with its separate 320W Charging Station; its EU table attributes 320 W to the pogo-pin path and 280 W to USB in total. Anker's 170 W peak needs both USB-C inputs, is not sustained and is normally reached above 55% battery. Neither selection includes that charging equipment.
EcoFlow builds in a 60 cm retractable USB-C cable rated for 140 W alongside three USB-C sockets. The A1340 source lists two USB-C sockets, USB-A and a separate 0.6 m 140 W cable. The retained A1340 US listing says sold out, so check a current exact-model seller.
These manufacturer specifications do not establish measured performance, noise, long-term reliability or running cost. We have not independently tested these products. Check current prices, stock and operating-space instructions with the seller and manufacturer.
RAPID Pro Power Bank 27,650mAh 300W (US package)EF-RAPIDPRO27K-US; RAPID Pro Power Bank (27,650mAh, 300W, 140W Built-in Cable) only; not the RP27K-C140 charger bundle or RP27K-STATION320W desktop-charger bundle
Power bank only; the 320W Charging Station and wall chargers are separate purchases. The store banner says it does not ship to outlying areas, including Puerto Rico, Hawaii and Alaska. No checkout, stock, shipment or safety certification is established.
Check the model, supplied cable and current recall instructions. No checkout, shipment or safety certification is established.
Source · 2026-10-11Anker: A1340 Prime 27K US specificationsChecked 2026-10-11. We reviewed the official page text on the check date. Checkout options were not verified.
Where to buy
RAPID Pro Power Bank 27,650mAh 300W (US package)
Select: EF-RAPIDPRO27K-US; RAPID Pro Power Bank (27,650mAh, 300W, 140W Built-in Cable) only; not the RP27K-C140 charger bundle or RP27K-STATION320W desktop-charger bundle
Prime 27K A1340 (US package)27650 mAhSource · 2026-10-11Anker: A1340 Prime 27K US specificationsChecked 2026-10-11. We reviewed the official page text on the check date. Checkout options were not verified.
Documented stored energy
A source-stated watt-hour rating for the exact model.
Unknown remains unknown; this value does not establish an airline or carrier approval.
We have not verified this value. It is not a confirmed no or zero. Check the original source or ask the manufacturer if it affects your choice.
The retrieved US specification did not establish watt-hours; no foreign-package capacity is silently inherited.Source · 2026-10-11Anker: A1340 Prime 27K US specificationsChecked 2026-10-11. We reviewed the official page text on the check date. Checkout options were not verified.
Maximum single USB-C output
The advertised maximum through one supported USB-C output.
The device and cable must support the required profile; it is not sustained power for every workload.
Prime 27K A1340 (US package)140 WSource · 2026-10-11Anker: A1340 Prime 27K US specificationsChecked 2026-10-11. We reviewed the official page text on the check date. Checkout options were not verified.
Maximum documented recharge input
The documented input maximum with the qualifications below.
Some peaks require two input ports or a particular battery level. Read the entire input workflow.
RAPID Pro Power Bank 27,650mAh 300W (US package)320 WThe US page states 320 W input without a port breakdown. EcoFlow's EU table for the same-named model attributes 320 W to the pogo-pin path, alone or with USB, and lists 280 W total through USB.Sources · 2026-10-21EcoFlow: RAPID Pro Power Bank 27,650mAh 300W US product page (EF-RAPIDPRO27K-US)Checked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.EcoFlow: RAPID Pro Power Bank 27,650mAh specification, EU store pageChecked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.
Prime 27K A1340 (US package)170 WSource · 2026-10-11Anker: A1340 Prime 27K US specificationsChecked 2026-10-11. We reviewed the official page text on the check date. Checkout options were not verified.
USB connection arrangement
The supplied output connectors, including built-in cables where stated.
A built-in cable is not a free socket; count the devices and connector types that you need.
RAPID Pro Power Bank 27,650mAh 300W (US package)Four USB-C outputs: one 60 cm retractable built-in cable and three USB-C sockets.Source · 2026-10-21EcoFlow: RAPID Pro Power Bank 27,650mAh 300W US product page (EF-RAPIDPRO27K-US)Checked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.
Prime 27K A1340 (US package)Two USB-C sockets and one USB-A socket.Source · 2026-10-11Anker: A1340 Prime 27K US specificationsChecked 2026-10-11. We reviewed the official page text on the check date. Checkout options were not verified.
Simultaneous-output conditions
Manufacturer sharing limits and unresolved allocation details.
Do not add individual port maxima or assume equal distribution between connected devices.
RAPID Pro Power Bank 27,650mAh 300W (US package)Up to 300 W total across the four outputs. Single-output maxima are 140 W for the built-in cable (C1) and C2, and 65 W each for C3 and C4. The page's two-, three- and four-port allocation diagrams were not available as text. Do not add the single-output maxima.Source · 2026-10-21EcoFlow: RAPID Pro Power Bank 27,650mAh 300W US product page (EF-RAPIDPRO27K-US)Checked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.
Prime 27K A1340 (US package)Up to 250 W aggregate advertised; this is not 250 W from one USB-C socket. Exact simultaneous allocation still needs the relevant mode diagram.Source · 2026-10-11Anker: A1340 Prime 27K US specificationsChecked 2026-10-11. We reviewed the official page text on the check date. Checkout options were not verified.
Recharge workflow
The input connection and conditions behind the advertised maximum.
A compatible high-power wall charger may be separate. Peak input is not a guaranteed complete-recharge time.
RAPID Pro Power Bank 27,650mAh 300W (US package)The 20-minute-to-80% claim uses the separate RAPID Pro 320W Charging Station. EcoFlow's EU table lists 140 W recharge through the cable or C1 and 280 W total through USB. Pass-through charging needs a charger rated 20 W or more, with input above output.Sources · 2026-10-21EcoFlow: RAPID Pro Power Bank 27,650mAh 300W US product page (EF-RAPIDPRO27K-US)Checked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.EcoFlow: RAPID Pro Power Bank 27,650mAh specification, EU store pageChecked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.
Prime 27K A1340 (US package)The 170 W peak needs both USB-C inputs and suitable chargers; it is not sustained and is normally reached above 55% battery. Single-port input is up to 140 W.Source · 2026-10-11Anker: A1340 Prime 27K US specificationsChecked 2026-10-11. We reviewed the official page text on the check date. Checkout options were not verified.
Unit weight
The source-reported weight of the pack.
Check whether cables or accessories are included in the measurement.
Prime 27K A1340 (US package)665 gSource · 2026-10-11Anker: A1340 Prime 27K US specificationsChecked 2026-10-11. We reviewed the official page text on the check date. Checkout options were not verified.
Cables and package limits
Documented supplied cables and unresolved packing-list details.
Do not inherit charging bases or cable bundles from another seller selection.
RAPID Pro Power Bank 27,650mAh 300W (US package)A 60 cm retractable USB-C cable rated for 140 W is built in. The US page gives no box list; EcoFlow's EU box list adds a flannel bag. Charger bundles are separate options, not this selection.Sources · 2026-10-21EcoFlow: RAPID Pro Power Bank 27,650mAh 300W US product page (EF-RAPIDPRO27K-US)Checked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.EcoFlow: RAPID Pro Power Bank 27,650mAh specification, EU store pageChecked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.
Prime 27K A1340 (US package)The source lists a 0.6 m USB-C to USB-C cable rated for 140 W. No charging base or wall charger is included by this selection.Source · 2026-10-11Anker: A1340 Prime 27K US specificationsChecked 2026-10-11. We reviewed the official page text on the check date. Checkout options were not verified.
Important qualifications
The evidence boundaries that affect this comparison.
Check the exact model and current support or recall instructions before relying on the package.
RAPID Pro Power Bank 27,650mAh 300W (US package)EcoFlow states over 80% capacity retention after 300 cycles and says airline rules vary by region and carrier. App and Wi-Fi features are optional. These are manufacturer claims, not measured delivered energy, a carrier approval or safety certification.Source · 2026-10-21EcoFlow: RAPID Pro Power Bank 27,650mAh 300W US product page (EF-RAPIDPRO27K-US)Checked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.
Prime 27K A1340 (US package)The retained US page says sold out; check a current exact-model seller. No stock or delivery promise is made.Source · 2026-10-11Anker: A1340 Prime 27K US specificationsChecked 2026-10-11. We reviewed the official page text on the check date. Checkout options were not verified.
Questions to check before buying
RAPID Pro Power Bank 27,650mAh 300W (US package)
The US page does not break the 320 W input down by port, and its multi-port allocation diagrams were not available as text.
The US box contents are not listed; the flannel bag in EcoFlow's EU box list is not assumed for the US package.
Prime 27K A1340 (US package)Read the source notes for the exact package and operating conditions.
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