BYD Battery-Box Premium HVM 22.1 vs EcoFlow STREAM Pro
Usable capacity: BYD Battery-Box Premium HVM 22.1 22.08 kWh, EcoFlow STREAM Pro –. Both models win equally often (1 of 5 points).
Who wins where
- BYD Battery-Box Premium HVM 22.1
- EcoFlow STREAM Pro
Biggest differences
| Fact | Battery-Box Premium HVM 22.1 | STREAM Pro |
|---|---|---|
| Expandable up to | 66.2 kWh | 11.52 kWh |
| Min. operating temperature | -10 °C | -20 °C |
Score per area = position (0–100) relative to all 130 models in this category; higher is better.
| Technical specifications | BYDBattery-Box Premium HVM 22.1 | EcoFlowSTREAM Pro |
|---|---|---|
| General | ||
| Cell chemistry | LFP 1 | LFP 2 |
| Smart charging on dynamic prices | – | Yes 2 |
| Wi-Fi / app | – | Yes 2 |
| Performance | ||
| Usable capacity | 22.08 kWh 1 | – |
| Nominal capacity | – | 1.92 kWh 2 |
| Expandable up to | 66.2 kWh ✓ 1 | 11.52 kWh 2 |
| Charge power (continuous) | – | 1.05 kW 2 |
| Discharge power (continuous) | – | 1.2 kW 2 |
| Efficiency | ||
| Round-trip efficiency | 96 % 1 | – |
| Electrical | ||
| Backup power | Yes 1 | Yes 2 |
| Off-grid capable | Yes 1 | Yes 2 |
| Dimensions & weight | ||
| IP rating | IP55 1 | IP65 2 |
| Min. operating temperature | -10 °C 1 | -20 °C ✓ 2 |
| Width | 585 mm 1 | 284 mm 2 |
| Height | 2,160 mm 1 | 458 mm 2 |
| Depth | 298 mm 1 | 255 mm 2 |
| Weight | – | 22.8 kg 2 |
| Warranty & lifespan | ||
| Warranted cycles | – | 6,000 2 |
| Warranty | 10 years 1 | 10 years 2 |
Sources
- Battery-Box Premium HVM – datasheet, BCU2.0 V1.0 EN (28.03.2025) — BYD Lithium Battery Co., Ltd. · accessed 27 Sept 2026
- EcoFlow STREAM Ultra/Pro Specifications, 1.0 — EcoFlow UK · accessed 29 Sept 2026