Anker
521
As of July 23, 2026, the Anker 521 delivered 192 Wh in OutdoorGearLab's testing, 75% of its 256 Wh rating.
Usable Wh (measured)
192
75% of the 256 Wh box rating
$ per usable Wh
—
No price yet
Specs
| Usable Wh (measured) | 192 |
|---|---|
| Rated (box) Wh | 256 |
| Rated AC output | 200 W |
| Weight | 8.4 lb |
| Chemistry | LiFePO4 |
| Price | Not tracked yet |
| $ per usable Wh | — |
Where the usable Wh comes from
OutdoorGearLab, updated July 23, 2026.
Measured AC energy output from 100% charge to empty at ~80% of rated max wattage (light-bar load).