Why does my power station lose capacity in the cold?
Troubleshooting Updated 2026-08-01
Two different things happen and they are easy to confuse. A cold battery delivers less of its stored energy, because the chemistry that moves charge slows down — that is a temporary loss and it comes back when the pack warms up. Separately, below a stated temperature the battery management system will not accept a charge at all, because charging a cold lithium cell plates metal onto the anode and that damage is permanent.
The second limit is much higher than the first. Every record we hold will discharge at temperatures well below the point at which it stops charging, so the normal winter experience is a machine that still runs your appliances and refuses to refill.
The two limits, side by side
One record, four temperatures
Published operating ranges from a single machine’s specification. The gap between the discharge floor and the charge floor is the winter problem in one line.
It will keep supplying loads down to here.
See the record →And refuses to charge below here. The two floors are not the same number.
The top of the window matters in a hot car or in direct sun.
Above this it protects itself and stops.
officialverified 2026-08-01BLUETTI Elite 100 V2 · US record
The same pattern holds across brands with different numbers. Anker SOLIX’s record and the two others in our charging comparison publish their own floors, and they are not interchangeable — which is why "lithium works to minus twenty" is a statement about discharge that people apply to charging and then damage a battery with.
How much capacity do you actually lose?
We do not publish a number for this, and the reason is worth stating. A cold-capacity figure is only meaningful with the temperature, the discharge rate and the cut-off voltage it was measured at, and none of the manufacturers in our library publish one for their finished product. Cell datasheets exist, but a cell curve is not a machine curve — the inverter, the internal heater where fitted, and the pack’s own thermal mass all sit between them. What we can tell you is the direction and the mechanism: the loss is temporary, it is larger at higher discharge rates, and it is smaller than most winter forum posts claim because part of what people observe is the charge refusal above, not lost capacity.
What actually works in the cold
- Keep the machine inside the insulated space, not in a locker or a truck bed. The pack’s own thermal mass will hold it above the charge floor for a long time if it starts warm.
- Charge it warm and use it cold, rather than the other way round. A pack that reaches the site full does not need to charge at the temperature that would refuse.
- Expect solar to behave oddly in the other direction: cold panels produce more voltage, not less, and that is its own problem.
- For winter camping, prefer loads that avoid the inverter entirely. A diesel air heater is a direct-current load drawing tens of watts, which is a very different proposition from resistive heating.