How to Store a Power Station So It's Ready for an Outage
Updated 2026-10-07
A power station bought for emergencies spends most of its life sitting in a closet. It will hold a charge for months, but not forever, and the way you store it affects both how much energy is there when you need it and how long the battery lasts.
How long does it hold a charge?
Two things drain a stored station:
- Self-discharge. Lithium cells lose a little charge on their own. For the LiFePO4 cells used in every station we list, this is slow: a few percent a month is a common figure.
- Standby draw. The electronics use some power even when nothing is plugged in. This is usually the bigger loss. A station left switched on, or with its AC outlets, Wi-Fi or display active, can empty itself in days or weeks.
So the answer depends mostly on whether it is fully off. A station that is powered down properly should still have most of its charge after several months. One left in standby may not.
What charge level to store it at
Brands differ, so follow the manual for your model. The usual guidance looks like this:
| Situation | Typical guidance |
|---|---|
| Long-term storage, not needed in a hurry | Store partly charged (often 50–80%) and top up every 3–6 months |
| Emergency backup you may need tonight | Keep it at or near full, and check it on a schedule |
| Left plugged in as a UPS | Fine if the manual supports it; set a charge limit if the app has one |
Storing at a partial charge is gentler on the cells. But a half-full battery gives you half the runtime, and for an emergency unit, having the energy matters more. LiFePO4 cells tolerate sitting near full better than older NMC chemistry; see LiFePO4 vs NMC.
The one thing to avoid is leaving it empty. A battery that sits at 0% for months can drop low enough that the station refuses to charge. If you run it flat during an outage, recharge it once the power is back.
Where to keep it
- Indoors, at room temperature. Heat ages batteries faster, and most stations can't charge below freezing. An unheated garage, a shed or a car trunk is a poor place for long-term storage.
- Dry and off the floor if the basement can flood.
- Easy to reach. A 60 lb station on a high shelf isn't much use in the dark. Weights are on each station page and the compare page.
A simple routine
- Turn it fully off before storing: main power off, not just the outlets.
- Set a reminder every three months. Switch it on, check the percentage, and top it up.
- Run it for real once or twice a year. Plug in the fridge or whatever you plan to back up and let it run for an hour. You'll confirm that it starts your appliance and that you know which cables you need.
- Keep the cables with it: the AC charging cable, any car or solar cable, and an extension cord.
- Update the firmware during one of these checks, not during a storm.
If you want it always ready
If checking every three months sounds like something you'll forget, leave the station plugged in where you'd use it. Most current models have a UPS or pass-through mode that keeps the battery topped up and switches over when the grid drops. See Can a power station work as a UPS? for the limits.
Bottom line
Switch it fully off, keep it indoors, and check the charge every three months. For a backup unit, store it near full; for one you only use on summer trips, a partial charge is easier on the battery. To work out how much runtime a full charge gives your appliances, use the runtime calculator.