CATL 314Ah vs EVE MB31 vs CALB 314Ah: The 314Ah Cell Showdown
The 314Ah capacity class has become the new standard for 48V home storage in 2026, delivering approximately 16.1 kWh per 16S pack. Three manufacturers compete for your build: CATL, EVE (MB31), and CALB. Here's the ultimate head-to-head.
Tested Performance Data
Independent testing across hundreds of cells reveals the real story behind spec sheets:
| Metric | CATL 314Ah | EVE MB31 | CALB 314Ah |
|---|---|---|---|
| Rated Capacity | 314Ah | 314Ah | 314Ah |
| Actual Capacity Range | 316-322Ah | 318-325Ah | 315-320Ah |
| % Above Rated | 0.6-2.5% | 1.3-3.5% | 0.3-1.9% |
| Internal Resistance | ≤0.20 mΩ | ≤0.22 mΩ | ≤0.25 mΩ |
| Weight | 5.6 kg | 5.65 kg | 5.7 kg |
| Dimensions | 72×173×207mm | 72×173×207mm | 72×173×207mm |
EVE's MB31 consistently tests highest above rated capacity, while CATL achieves the lowest internal resistance. CALB's specs are solid but less exceptional in any single metric.
Cycle Life: The Long Game
| Brand | Rated Cycles | Real-World Expectation (80% DoD) | Years at 1 cycle/day |
|---|---|---|---|
| CATL 314Ah | 8,000+ | 10,000-12,000 | 27-33 |
| EVE MB31 | 8,000+ | 10,000-13,000 | 27-36 |
| CALB 314Ah | 9,000+ | 11,000-14,000 | 30-38 |
CALB's aerospace heritage shows in cycle life. If you're building a system you plan to pass down to your children, CALB has the edge. But at one cycle per day, all three will outlast your inverter by a decade or more.
Consistency: The Hidden Differentiator
For DIY builds, cell-to-cell consistency matters more than individual cell specs:
| Consistency Metric | CATL | EVE MB31 | CALB |
|---|---|---|---|
| Voltage spread (16 matched cells) | ≤8 mV | ≤12 mV | ≤10 mV |
| IR spread (16 matched cells) | ≤0.05 mΩ | ≤0.08 mΩ | ≤0.06 mΩ |
| Capacity variation | ≤1.5% | ≤2.5% | ≤2.0% |
CATL's automotive OEM experience translates to the tightest manufacturing tolerances. If you're buying 16 cells and want them as closely matched as possible, CATL delivers the most predictable results.
Pricing (2026 Grade A)
| Brand | Per Cell | 16S Cell Cost | Cost per kWh |
|---|---|---|---|
| CATL 314Ah | $48-58 | $768-928 | $48-58 |
| EVE MB31 | $44-54 | $704-864 | $44-54 |
| CALB 314Ah | $50-60 | $800-960 | $50-60 |
EVE MB31 is consistently the most affordable, with CATL and CALB at a 5-10% premium. All three represent outstanding value at under $60/kWh for Grade A cells.
Availability and Supply
| Brand | EU Warehouse | US Warehouse | China Direct |
|---|---|---|---|
| CATL 314Ah | ⚠️ Limited | ⚠️ Limited | ✅ Available |
| EVE MB31 | ✅ In stock | ✅ In stock | ✅ Available |
| CALB 314Ah | ✅ In stock | ⚠️ Limited | ✅ Available |
EVE has the strongest warehouse availability, especially in the EU and US. If you need cells fast, EVE is the safest choice.
The Final Verdict
Best overall value: EVE MB31 — lowest price, highest actual capacity, best availability. The choice for most DIY builders.
Best consistency: CATL 314Ah — tightest manufacturing tolerances. The choice for professional installations and multi-pack systems.
Best longevity: CALB 314Ah — highest cycle life rating. The choice for systems designed to last 30+ years.
The honest answer: For a single 16S home storage build, any of these three will serve you exceptionally well. The differences that matter most are price and availability — and on those metrics, EVE's MB31 wins in 2026.