What is Cycle Life in a Sodium Battery?

July 31, 2026

Table of Content

1. What is Cycle Life？

Cycle life is the number of complete charge-discharge cycles a battery can handle before its capacity drops below 80% of its original level.

Think of it as the mileage of a battery. Just like a car engine wears out after a certain number of miles, a battery wears out after a certain number of cycles. When a battery reaches the end of its cycle life, it doesn’t stop working entirely – it just can’t hold as much charge as it used to.

2. How is Cycle Life Measured？

Cycle life is measured under a standard called Depth of Discharge (DOD) – the percentage of the battery used before recharging.

The industry standard for testing is 80% DOD. This means: discharge the battery to 20% remaining capacity, then recharge to 100%. Repeat. Count how many times this can happen before capacity drops to 80%.

Why 80%? Because below 80%, the battery is no longer considered reliable for starting vehicles. It still holds charge – just not enough to consistently start an engine.

3. What Affects Cycle Life？

Factor	How it affects cycle life
Depth of discharge	Shallower discharge = more cycles
Temperature	Extreme heat or cold reduces cycle life
Charge speed	Faster charging creates more stress
BMS quality	Good BMS protects cells and extends life

Key rule: 80% DOD is the standard. Going deeper reduces life. Staying shallower extends it.

4. How Many Cycles Can You Expect?

Battery Type	Cycle Life (80% DOD)
Lead-acid	300-500 cycles
JIEYO Sodium-ion	6,000+ cycles

5. Cycle Life vs. Starting Cycles – Two Different Numbers

Batteries have two different “lifespan” numbers, and they measure different things.

Cycle life (6,000 cycles) measures full charge-discharge cycles – how many times you can drain and recharge the battery before it degrades.

Starting cycles (≥80,000 starts) measures how many times the battery can start an engine – each start is a short burst of power, not a full charge-discharge cycle.

Both matter. A battery with 6,000 cycle life and 80,000 starting cycles means: you buy it once, and it starts your vehicle reliably for years.

6. A Quick Reality Check

6,000 cycles = 8-10 years of daily use
12x longer than lead-acid – one sodium battery outlasts 12 lead-acid batteries
80,000+ starts – confidence that your vehicle will start, every time
Lower cost over time – higher upfront, lower long-term cost

The Bottom Line

Question	Answer
What is cycle life?	Number of full charge-discharge cycles before capacity drops to 80%
How is it measured?	80% DOD standard – discharge to 20%, recharge, repeat
JIEYO sodium battery cycle life?	6,000 cycles
What about starting cycles?	≥80,000 starts – starts your engine reliably for years
Compare to lead-acid?	12x longer
How long in years?	8-10 years of daily use

A JIEYO sodium battery gives you 6,000 cycles and 80,000 starts. That’s not just a battery – that’s 12 lead-acid batteries in one. You buy it once. It lasts for years.

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