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 VTOMAN $269.99$139.98
The VTOMAN FlashSpeed 300 is the better portable power station overall, rated 3.5 to 2.7. The VTOMAN FlashSpeed 300 leads on value, battery life and AC output. The Duracell M250 wins on portability. The VTOMAN FlashSpeed 300 costs $109.02 less ($139.98 vs $249).
Duracell M250
#24 in SmallFull review
For people who want a tidy desk or bedside battery for phones and laptops, with wireless charging and a small AC outlet. Anyone who needs to run appliances should buy a conventional power station.
Amazon $249 Duracell $249$249
Prices were last checked October 20, 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 $1.14 per rated Wh), battery life (LiFePO4, 3,000 cycles, 2-year warranty vs Li-ion NMC, 500 cycles, 2-year warranty) and AC output (300 W continuous AC vs 100 W continuous AC).
- Choose the Duracell M250 for portability (107 Wh per kg (4.5 lb (2 kg)) vs 69 Wh per kg (7.4 lb (3.4 kg))).
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 | Duracell M250 |
|---|---|---|
| Overall rating | 3.5/5 | 2.7/5 |
| Value 25% | 86 $0.61 per rated Wh | 40 $1.14 per rated Wh |
| Tested capacity 15% | 50 not yet independently tested (neutral score used) | 50 not yet independently tested (neutral score used) |
| Battery life 15% | 76 LiFePO4, 3,000 cycles, 2-year warranty | 15 Li-ion NMC, 500 cycles, 2-year warranty |
| AC output 15% | 41 300 W continuous AC | 0 100 W continuous AC |
| Charging speed 10% | 50 full AC charge time not published (neutral score used) | 16 0-100% on AC in 3 h 30 min |
| Portability 10% | 43 69 Wh per kg (7.4 lb (3.4 kg)) | 100 107 Wh per kg (4.5 lb (2 kg)) |
| Solar input 5% | 28 90 W max solar input | 50 solar input not published (neutral score used) |
| Features 5% | 20 100 W USB-C | 20 100 W USB-C |
Specifications
| VTOMAN FlashSpeed 300 | Duracell M250 | |
|---|---|---|
| Battery | ||
| Rated capacity | 230 Wh | 219 Wh |
| Chemistry | LiFePO4 | Li-ion NMC |
| Cycle life | 3,000 3000+ cycles to 80% | 500 to 80% |
| Expandable | - | No |
| Output | ||
| AC output | 300 W (600 W surge) | 100 W |
| AC outlets | 2 total | 1 total |
| 120V 15A outlets (NEMA 5-15R) | 2 | - |
| 120V 2-prong outlets (NEMA 1-15R) | - | 1 |
| AC waveform | - | Modified sine wave |
| USB-C ports | 1 (100 W) | 2 (up to 100 W each) |
| USB-A ports | 3 | 2 |
| 12 V car outlet | Yes | No |
| DC5521 ports | 1 | 0 |
| UPS / pass-through | - | No |
| Charging | ||
| AC charging | 90 W | - |
| Full AC charge time | - | 3 h 30 min (About 3.5 h from a USB-C wall charger, about 5.5 h on the included 60W charging dock (manufacturer); Amazon listing says 3 h by USB-C) |
| Max solar input | 90 W | - |
| Solar input voltage | 12-30V DC input (90W max) | - |
| Build | ||
| Weight | 7.4 lb (3.4 kg) | 4.5 lb (2 kg) |
| Dimensions | - | 5.0 in diameter x 10.4 in tall |
| App | - | - |
| Warranty | 2 years | 2 years |