We get a lot of questions every fall about how to store Epoch batteries over the winter. The good news: your LiFePO4 battery needs very little to get through the off-season — but a few minutes of prep now protects its capacity and keeps your warranty intact. Follow the six steps below, then check the section that matches your climate.
The six-step winterization
- Charge to 50–80%. A partial charge is the sweet spot for long-term storage. Do not store the battery fully drained.
- Disconnect all loads. Remove or switch off every draw — inverters, trackers, alarms, propane detectors and phantom loads.
- Power the battery off. If your model has a power button or Bluetooth on/off, use it to minimize standby drain.
- Store cool and dry. The ideal ambient range is 32–77°F (0–25°C). Avoid damp floors and direct sun.
- Check voltage monthly. Top back up to 50–80% any time it drifts low. Bluetooth models make this a 30-second check.
- Recharge to 100% in spring. A full charge re-calibrates the BMS state-of-charge reading and restores full performance.
Storage temperature limits
- Storage up to 1 month: down to -20°C / -4°F.
- Storage longer than 1 month: keep at or above 0°C / 32°F.
Cold does not damage a resting LiFePO4 battery — charging a frozen one does. Never charge below 32°F (0°C) unless your battery has Epoch's built-in self-heating.
Winter storage by region and climate
Where you store your battery changes what you need to watch for. In cold regions the concern is freezing; in mild and hot regions it is corrosion, humidity and heat. Find your region below.
Region | What you're up against | What to do |
|---|---|---|
Cold / Deep Freeze Upper Midwest, Northeast, Mountain West, Canada | Sustained temperatures below 0°F; a long season | Bring batteries indoors (basement, heated garage) if stored more than a month. If they stay in the rig or boat, disconnect fully and accept no charging until spring. Heated models may stay in place and self-heat, but only if a charge source is present. |
Temperate / Four-Season Mid-Atlantic, Midwest, Pacific Northwest | Freeze-thaw cycling, damp | An unheated garage is usually fine. Prioritize dryness over warmth — condensation on terminals is the bigger risk here. Elevate off concrete and check voltage monthly. |
Mild / Coastal Southeast, Gulf Coast, Southern California | Rarely freezes; salt air, humidity | Temperature is a non-issue. Focus on corrosion: clean terminals and apply dielectric grease, and store away from salt spray. Storing at 100% for months is the real risk — hold 50–80%. |
Hot & Dry Desert Southwest, Inland Texas | Winter is mild, but storage spaces run hot | Heat ages cells faster than cold. Keep below 77°F — the shaded north side of a garage beats an attic, shed or closed vehicle, which can exceed 100°F even in winter. |
High-altitude adjustments (above ~5,000 ft / 1,500 m)
Storing in the mountains? A few extra precautions apply:
- Colder nights, bigger swings. Thin air holds less heat, so a garage at 7,000 ft can swing 40°F overnight. Rely on measured temperature, not the forecast — put a min/max thermometer where the battery sits.
- Self-heating draws more power. Heated models work harder and longer at altitude. If self-heating is enabled over winter, keep a charge source connected — otherwise disable it and store the battery disconnected from loads.
- Thinner air cools electronics less. Reduced air density carries heat away less efficiently. Leave 2–3 in. of clearance around the case rather than boxing it in tightly.
- Intense UV and dry air. Sun exposure at altitude is far stronger. Store the battery out of direct sunlight; the case surface can heat well above ambient even on a cold day.
Good news: altitude itself does not harm LiFePO4 chemistry. Sealed cells are unaffected by air pressure — every adjustment above is about temperature and sun, not elevation. Ground shipping and air travel limits are likewise unchanged.
Questions?
Always follow the manual for your specific model. If you have questions about storing your Epoch batteries, contact Epoch Support at 1-888-501-1846, support@epochbatteries.com or epochbatteries.com/support.
