Anker 521 PowerHouse

Last updated: October 20, 2026

Anker 521 PowerHouse
3.3/5#21 of 24 in small power stations
3.3

For campers and travelers who want a small, long-lived LiFePO4 battery for phones, laptops, lights and CPAP. Larger or faster-charging stations give more for the money if you need to run appliances.

  • 256 WhCapacity
  • 300 WAC output
  • 8.2 lbWeight
  • LiFePO4Battery
  • $1.02Price / Wh
Check price at Amazon$259.99Check price at Anker SOLIX$259.99

Price checked October 20, 2026. As an Amazon Associate we earn from qualifying purchases.

Pros
  • LiFePO4 battery rated for 3,000 cycles, with a 5-year warranty
  • At about 8 lb it carries easily in one hand
  • Built-in light bar is handy at a campsite or in an outage
  • Recharges from USB-C and the DC adapter at the same time
Cons
  • Only 65W of solar input, so a solar recharge takes most of a day
  • A single 60W USB-C port won’t fast-charge larger laptops
  • Anker’s own documents disagree on AC output (200W or 300W), so plan for 200W loads
  • No app or UPS function, and no independent capacity test published

How it scores

The rating comes from 8 measured or published factors, each scored 0-100 against fixed reference points for its size. How we rank explains each one.

Specifications

Battery
Rated capacity256 Wh
ChemistryLiFePO4
Cycle life3,000 to 80%
ExpandableNo
Output
AC output300 W (600 W surge)
AC outlets2 total
120V 2-prong outlets (NEMA 1-15R)2
USB-C ports1 (60 W)
USB-A ports2
12 V car outletYes
Charging
AC charging125 W
Max solar input65 W
Solar input voltage11-28V, 5.5A
Build
Weight8.2 lb (3.7 kg)
Dimensions8.5 x 8.3 x 5.7 in
AppFalse
Warranty5 years

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