How long does a LiFePO4 lithium battery last?
A well-cared-for LiFePO4 battery lasts many years longer than lead-acid. Expion360 backs every house battery with a 12-year warranty — the longest in the lithium house-battery category — stated as a term rather than a cycle count. How long a particular battery lasts depends mostly on heat, charge and discharge rates, charging temperature and how it's stored, all of which you control.
What does the Expion360 12-year warranty cover?
The term runs from the date of sale and applies to every Expion360 house battery.
| Years from date of sale | If found defective in materials or workmanship |
|---|---|
| 0–8 | Repaired or replaced |
| 8–10 | Repaired where repairable; otherwise a discounted replacement |
| 10–12 | Repaired where repairable; otherwise a discounted replacement |
What shortens the life of a LiFePO4 battery?
The lifespan of a LiFePO4 battery is primarily reduced by excessive heat, aggressive charge and discharge rates, improper charging temperatures, and poor storage conditions. Fortunately, these are all variables you can control. With proper care, a LiFePO4 battery will outlast a traditional lead-acid battery by many years, which is why Expion360 backs every house battery with an industry-leading 12-year warranty.
The battery management system blocks the most damaging conditions — it stops charging below 32°F (0°C) on unheated models and disconnects when current exceeds the limit — but it can't stop slower wear from running at the maximum rating every day. Running inside the recommended rates is what keeps cell temperature low.
How do I make a lithium battery last longer?
Charge at about 0.2C (20A per 100Ah) and keep everyday loads near 0.5C. Use a charger, converter, DC-to-DC charger or solar controller with a LiFePO4 profile — 14.4 to 14.6V bulk and absorption, about 13.6V float on 12V models. Keep the battery out of extreme heat, don't charge it below freezing unless it's a VHC™ heated model, and connect only batteries of the same model together.
Recommended rates, a LiFePO4 charge profile, and a cool, ventilated compartment.
Partial state of charge, loads and chargers disconnected, and within the published storage temperature range.
Does running a lithium battery down all the way hurt it?
Not the way it hurts lead-acid. A lead-acid battery should only be discharged to about half, while a LiFePO4 battery delivers nearly its full rated capacity. The BMS disconnects before the cells are over-discharged. Regularly running the battery until the BMS cuts out is harder on it than stopping a little earlier, and a battery left fully discharged for weeks can drop too low to recover easily.
How does LiFePO4 life compare with lead-acid?
Expion360's charging guide puts LiFePO4 service life at roughly ten times that of a standard lead-acid battery used the same way.
| Expion360 LiFePO4 | AGM / flooded lead-acid | |
|---|---|---|
| Usable capacity of a 100Ah battery | ~100Ah | ~50Ah |
| Service life | Roughly 10× standard lead-acid, per Expion360 guidance | Baseline |
| Warranty | 12 years | Varies by brand |
| Maintenance | None — sealed | Flooded: water and equalizing; AGM: none |
| How it ages | Gradual loss of capacity | Sulfation, accelerated by partial charging |
| Charging below 32°F (0°C) | VHC™ models heat first, then charge | Yes, slowly |
Actual life depends on temperature, charge and discharge rates and storage.
How do I know if my lithium battery is wearing out?
LiFePO4 batteries don't just suddenly die; they gradually lose a small amount of capacity each year. Tracking this is easy: if you have a SmartTalk™ battery, the e360 app displays the state of health and cycle count so you can monitor capacity over time. For other models, a shunt monitor will show you exactly how many amp-hours you are getting from a full charge down to empty. If your battery is under 12 years old and isn't holding the charge it should, make sure it is registered and contact Expion360 support for assistance.