VTOMAN FlashSpeed 300
#13 in SmallFull review
A small, inexpensive LiFePO4 box for phones, laptops, CPAP and camp lights. Pick it for portability, not for running appliances.
Amazon $139.98$139.98
The VTOMAN FlashSpeed 300 is the better portable power station overall, rated 3.5 to 3.1. The VTOMAN FlashSpeed 300 leads on value, features and solar input. The Anker 521 PowerHouse wins on battery life. The VTOMAN FlashSpeed 300 costs $120.01 less ($139.98 vs $259.99).
Anker 521 PowerHouse
#25 in SmallFull review
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.
Amazon $259.99 Anker SOLIX $259.99$259.99
Prices were last checked October 24, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Which should you buy?
- Choose the VTOMAN FlashSpeed 300 for value ($0.61 per rated Wh vs $1.02 per rated Wh), features (100 W USB-C vs no UPS, expansion or app) and solar input (90 W max solar input vs 65 W max solar input).
- Choose the Anker 521 PowerHouse for battery life (LiFePO4, 3,000 cycles, 5-year warranty vs LiFePO4, 3,000 cycles, 2-year warranty).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every small portable power station; a clear win is highlighted. How we rank explains each one.
| Factor weight | VTOMAN FlashSpeed 300 | Anker 521 PowerHouse |
|---|---|---|
| Overall rating | 3.5/5 | 3.1/5 |
| Value 25% | 86 $0.61 per rated Wh | 51 $1.02 per rated Wh |
| Tested capacity 15% | 50 not yet independently tested (neutral score used) | 23 75% of rated capacity delivered (1 test) |
| Battery life 15% | 76 LiFePO4, 3,000 cycles, 2-year warranty | 91 LiFePO4, 3,000 cycles, 5-year warranty |
| AC output 15% | 41 300 W continuous AC | 41 300 W continuous AC |
| Charging speed 10% | 47 0-100% on AC in 2 h 30 min | 50 full AC charge time not published (neutral score used) |
| Portability 10% | 43 69 Wh per kg (7.4 lb (3.4 kg)) | 44 69 Wh per kg (8.2 lb (3.7 kg)) |
| Solar input 5% | 28 90 W max solar input | 12 65 W max solar input |
| Features 5% | 20 100 W USB-C | 0 no UPS, expansion or app |
Independent capacity tests
VTOMAN FlashSpeed 300
No independent test published yet.
Anker 521 PowerHouse
| Tested by | Usable AC energy | Of rated | Conditions |
|---|---|---|---|
| OutdoorGearLab | 192 Wh | 75% | AC output test; load not stated. Measured charging speed 62 Wh/hr (about 4.1 hr full recharge). |
Specifications
| VTOMAN FlashSpeed 300 | Anker 521 PowerHouse | |
|---|---|---|
| Battery | ||
| Rated capacity | 230 Wh | 256 Wh |
| Tested usable capacity | - | 192 Wh (75%) |
| Chemistry | LiFePO4 | LiFePO4 |
| Cycle life | 3,000 3000+ cycles to 80% | 3,000 to 80% |
| Expandable | - | No |
| Output | ||
| AC output | 300 W (600 W surge) | 300 W (600 W surge) |
| AC outlets | 2 total | 2 total |
| 120V 15A outlets (NEMA 5-15R) | 2 | - |
| 120V 2-prong outlets (NEMA 1-15R) | - | 2 |
| USB-C ports | 1 (100 W) | 1 (60 W) |
| USB-A ports | 3 | 2 |
| 12 V car outlet | Yes | Yes |
| DC5521 ports | 1 | - |
| Charging | ||
| AC charging | 90 W | 125 W |
| Full AC charge time | 2 h 30 min (Manufacturer: about 2.4-2.6 h from the wall adapter, USB-C or car) | - |
| Max solar input | 90 W | 65 W |
| Solar input voltage | 12-30V DC input (90W max) | 11-28V, 5.5A |
| Car charging | 90 W | 65 W |
| Build | ||
| Weight | 7.4 lb (3.4 kg) | 8.2 lb (3.7 kg) |
| Dimensions | - | 8.5 x 8.3 x 5.7 in |
| App | - | - |
| Warranty | 2 years | 5 years |
| Released | 2024-09 | 2021-12 |