VTOMAN FlashSpeed 300
#14 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 3.3. The VTOMAN FlashSpeed 300 leads on battery life, charging speed and features. The MARBERO M823 wins on portability. The VTOMAN FlashSpeed 300 costs $4.01 less ($139.98 vs $143.99).
MARBERO M823
#25 in SmallFull review
A very light, low-cost 237Wh station for charging phones, cameras and a CPAP on short trips. Buyers who need longer battery life or laptop-speed USB-C should look at LiFePO4 models.
Amazon $143.99$143.99
Prices were last checked October 22, 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 battery life (LiFePO4, 3,000 cycles, 2-year warranty vs Lithium-ion, 1-year warranty), charging speed (0-100% on AC in 2 h 30 min vs 0-100% on AC in 6 h) and features (100 W USB-C vs no UPS, expansion or app).
- Choose the MARBERO M823 for portability (114 Wh per kg (4.6 lb (2.1 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 | MARBERO M823 |
|---|---|---|
| Overall rating | 3.5/5 | 3.3/5 |
| Value 25% | 86 $0.61 per rated Wh | 86 $0.61 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 Lithium-ion, 1-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 | 0 0-100% on AC in 6 h |
| Portability 10% | 43 69 Wh per kg (7.4 lb (3.4 kg)) | 100 114 Wh per kg (4.6 lb (2.1 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 | 0 no UPS, expansion or app |
Specifications
| VTOMAN FlashSpeed 300 | MARBERO M823 | |
|---|---|---|
| Battery | ||
| Rated capacity | 230 Wh | 237 Wh |
| Chemistry | LiFePO4 | Lithium-ion |
| Cycle life | 3,000 3000+ cycles to 80% | - |
| Output | ||
| AC output | 300 W (600 W surge) | 300 W (375 W surge) |
| AC outlets | 2 total | 2 total |
| 120V 15A outlets (NEMA 5-15R) | 2 | 1 |
| 120V 2-prong outlets (NEMA 1-15R) | - | 1 |
| AC waveform | - | Pure sine wave |
| USB-C ports | 1 (100 W) | 1 (18 W) |
| USB-A ports | 3 | 4 |
| 12 V car outlet | Yes | No |
| DC5521 ports | 1 | - |
| Charging | ||
| AC charging | 90 W | - |
| Full AC charge time | 2 h 30 min (Manufacturer: about 2.4-2.6 h from the wall adapter, USB-C or car) | 6 h ("Fully quick charged in 6hrs" from the wall per the listing; 8 hr from a 12V car socket) |
| Max solar input | 90 W | - |
| Solar input voltage | 12-30V DC input (90W max) | 16.4-24V |
| Car charging | 90 W | - |
| Build | ||
| Weight | 7.4 lb (3.4 kg) | 4.6 lb (2.1 kg) |
| Dimensions | - | 8.15 x 5.83 x 3.90 in |
| Warranty | 2 years | 1 years |