B300K for AC200L/AC300 vs EcoFlow DELTA 2 Max Smart Extra Battery
Compatibility note: expansion batteries only attach to their own brand's stations — this one pairs with BLUETTI systems, the other with EcoFlow's. Read this as a value and longevity comparison (which ecosystem is cheaper to expand), not a choice between interchangeable parts.
- Price today: EcoFlow is $300 cheaper ($899 vs $1,199).
- Cost per Wh: $0.43 vs $0.44 — B300K for AC200L/AC300 gives you more battery per dollar today.
| B300K for AC200L/AC300 | EcoFlow DELTA 2 Max Smart Extra Battery | |
|---|---|---|
| Price today | $1,199 | $899 |
| Deal status | Normal price | Normal price |
| Capacity | 2765Wh | 2048Wh |
| $/Wh | $0.43 | $0.44 |
| Chemistry | LFP | LFP |
| Rated cycles | 4,000 cycles | — |
| Output | — | — |
| Solar input | — | — |
| Weight | 65.04 lbs | 42 lbs |
| Expandable | — | — |
| Standalone use | Yes — USB-A 12W | — |
| Recharge without station | No — only through the station | — |
| Recorded low | $949 (2026-09-07) | $799 (2026-07-07) |
| View at BLUETTI — $1,199 | View at EcoFlow — $899 |
Full tech-spec comparison all specs
| B300K for AC200L/AC300 | EcoFlow DELTA 2 Max Smart Extra Battery | |
|---|---|---|
| Battery | ||
| Chemistry | LFP | LFP |
| Capacity | 2,765Wh | 2,048Wh |
| General & physical | ||
| Weight | 65.04 lbs | 42 lbs |
Also published by B300K for AC200L/AC300
| Rated cycles | 4,000+ |
|---|---|
| AC outlets | 0 (link port only) |
| USB-C ports | 0 (link port only) |
| USB-A ports | 1× 12W |
| 12V / car output | 0 (link port only) |
| AC input | None — recharges via the station only |
| Solar (PV) input | None — recharges via the station only |
| Car input | None — recharges via the station only |
| Dimensions | 20.67 × 12.87 × 8.23 in |
| Operating temperature | -4°F to 104°F |
| Warranty | 3 years |
Like-for-like specs both brands publish are shown first (✓ = better value); each brand's remaining published specs follow. Core figures are editorially verified; the rest come from each manufacturer's tech specs.
Price history — B300K for AC200L/AC300
Price history — EcoFlow DELTA 2 Max Smart Extra Battery
Prices recorded daily from the official BLUETTI and EcoFlow stores. Deal statuses compare each product to its own 90-day history — methodology.