Comparison
Sodium-ion vs lithium
Both are sealed, long-life batteries. The difference is size, climate and how proven the chemistry is.
| Sodium-ion | Lithium iron phosphate | |
|---|---|---|
| Size and weight | Bigger and heavier for the same energy | More compact and lighter |
| Temperature range | Designed for a wide range, including cold | Good, but charging is limited near or below freezing |
| Charge cycles | Thousands (varies by maker) | Several thousand, well documented |
| Materials | Sodium; no cobalt, no nickel, no lithium | Lithium and iron phosphate; no cobalt |
| Track record | New to the market | Widely deployed |
| Price | Varies; falling as production grows | Established, competitive |
Choose lithium when
- Wall or floor space is tight
- You want the longest documented field record
- The room is air conditioned and stable
Choose sodium-ion when
- The room gets very hot or very cold
- Weight is less of a concern than climate
- You want to avoid lithium supply and price swings
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