Power Stations in Cold Weather and Storage: Keep Yours Ready

A power station still works below freezing, down to its rated minimum (often 14°F or −4°F), but you lose about 15% of its capacity around 14°F and about 35% around −4°F, and it won't charge at all below 32°F. For storage, follow your manual: most makers want it partly charged and topped up every few months, and none want it left empty. If it's your outage backup, keep it fuller than storage advice suggests and check it on a schedule.

Does cold weather reduce a power station's capacity?

Yes. Lithium cells deliver less energy when cold. In a 2025 study of a commercial LiFePO4 module, capacity fell by about 15% at 14°F (−10°C) and about 35% at −4°F (−20°C) against room temperature. The battery isn't damaged; the energy comes back when it warms up. Manufacturers say the same in general terms: BLUETTI's manuals warn that low temperature can greatly affect capacity.

Here's what that means for a fridge and Wi-Fi router on two stations rated to discharge down to −4°F:

Why won't a power station charge below 32°F?

Charging lithium cells below freezing plates metallic lithium onto the anode, and that damage is permanent. So every manual we've read, from EcoFlow, Jackery, BLUETTI and Anker, sets 32°F (0°C) as the minimum charging temperature, and the battery management system enforces it. EcoFlow notes that it goes by the battery pack's actual temperature, not the air around it.

That matters most for solar in winter. A station left outside overnight at 20°F won't take a charge from the morning sun until the cells warm up, which can be hours. Keep it indoors, in the tent or in the cabin, and run only the panel cable outside. After a full drain, BLUETTI also asks owners to keep the unit between 41 and 95°F for 24 hours before recharging.

Do any power stations heat their own batteries?

Some 12 V LiFePO4 RV batteries have built-in heaters that warm the cells before charging. We haven't confirmed a built-in self-heating feature on any current mainstream US power station, so we don't assume one. If a listing claims cold charging, look for it in the official spec sheet or manual, with the temperature it works down to, before relying on it.

How should you store a power station?

Makers don't agree, so the manual for your model is the rule. Here's what each says:

The common ground: store it cool and partly charged, roughly half, check it about every 3 months, and never leave it empty. Battery University's general lithium-ion advice is about 40% at around 59°F, because heat combined with a full charge speeds up aging. Capacity fades slowly with time even when the unit isn't used, faster in heat and at high charge; how long a power station lasts covers cycle ratings and calendar aging.

Why does a stored power station lose charge?

The cells themselves lose little over a few months. The bigger drain is the electronics: the battery management system, the app radio and, above all, an inverter left on. Our calculator assumes about 12 W of standby for a mid-size unit with AC switched on and 18 W for a 2 kWh-class unit. That is 288 to 432 Wh a day, enough to empty a 2,048 Wh station in about 4 days with nothing plugged in.

Before you put it away, switch off AC, DC and USB outputs and close the app connection if your model lets you. Then the top-up schedule in your manual is all it needs.

How do you keep a power station ready for outages?

• Pick a storage level for your situation. In hurricane or winter-storm country, keeping it near full means it's ready when the forecast turns; the faster aging at high charge is a fair trade. If you only use it for summer trips, store it at the level your manual gives.
• Set calendar reminders at your manual's interval, usually every 3 months, to check the charge and top it up.
• Top up before the season. Atlantic hurricane season starts June 1; winter storms run December through March. Charge to full before each, and again as soon as a storm is forecast.
• Recharge right after an outage, so it isn't sitting empty, which Jackery warns can leave a unit unchargeable.
• Update the firmware while you're at it. Recent big-brand recalls were fixed by firmware.

Why turn off ECO mode for a fridge or CPAP?

Many stations switch the AC output off automatically when the load is small, to save standby power. BLUETTI's ECO mode is on by default and shuts AC off below about 40 W on the AC70P. Jackery's Energy Saving Mode, also on by default, turns all outputs off after 12 hours if the AC load is 25 W or less. A fridge between compressor cycles, or a CPAP overnight, can fall under those thresholds and get switched off. EcoFlow advises setting AC to “Always on” for a fridge holding medicine. Before an outage, turn ECO or energy-saving mode off for anything that has to keep running.

Tips for using a power station in winter

• Run it indoors. It makes no exhaust, so a heated room keeps the battery warm and its capacity up. Keep the vents clear. In a small space, see the apartment picks.
• Recharge once it's warm. Driving with the station in a heated cabin works; see charging from a car.
• Plan for less capacity. Size up by about 15% if the battery will sit near 14°F.
• Skip electric heat. A space heater drains even large stations in hours; see whether a power station can run a space heater. An electric blanket goes much further.
• Keep the furnace running instead if it's gas: the blower is the electrical part, covered in the gas furnace guide.

The full storm plan, including what to keep running, is in the winter storm power outage plan.