A portable power station is a battery with real wall sockets. That is the whole point of it, and it is what separates it from a power bank.

It runs the things a USB battery cannot: a cool box on a camping trip, a CPAP machine through a power cut, a laptop and the broadband router when you cannot afford to lose either.

The catch is the word portable. It covers everything from a 4.7kg unit you lift with one hand to a 39kg workhorse that lives in the utility room and never moves.

Buy too small and you run flat halfway through the outage. Buy too big and you carry dead weight around a campsite you never use.

So this guide sorts the shortlist by the job you have, smallest first. There is no single best portable power station, only the right one for the job, so we match the numbers to real use and name a pick for each.

Watt-hours (Wh) is the tank. It is how much energy the station holds. Roughly: 286Wh keeps phones, a laptop and a camp light going for a weekend, around 1000Wh runs a small fridge overnight, and 2000Wh carries a home through a longer outage.

Watts (W) is the tap. It is the most the station can deliver at once. A 600W unit will not start a 1500W kettle no matter how big its tank is.

Add up the wattage of everything you want running at the same time and stay under the rating.

Recharge and chemistry decide whether it is ready when you need it. LiFePO4 is now standard on good units: 3000 to 4000 charge cycles against a few hundred for older lithium, so it lasts years, not months.

Fast AC recharge matters most for backup, where you may only get a short window at the wall to refill. Several picks here reach full in about an hour.

Start with what you want to plug in

Write down the appliances, then find their wattage on their labels. Add up anything that will run at the same time.

That total is your minimum AC output. A station below it will refuse to start the load no matter how large its battery is.

Then work out how long you need it

Divide the station’s watt-hours by the appliance’s watts for a rough runtime. A 1000Wh station running a 50W mini-fridge lasts roughly 20 hours.

Real figures come in a little lower, because no station converts its stored energy at 100 percent efficiency.

LiFePO4 is why it is still working in five years

Lithium iron phosphate cells are rated for 3000 to 4000 charge cycles against a few hundred for older lithium chemistries. Every pick here uses it.

A LiFePO4 power station costs a little more up front and is still holding useful charge long after an older lithium unit has faded.

If a listing does not say LiFePO4, assume it is not.

Recharge time matters more than people expect

For backup you may only get a short window at the wall between cuts. A station that refills in an hour is far more useful than one that takes six.

Check the UPS switchover figure too, quoted in milliseconds. Under about 20ms keeps a desktop computer and a router running through a cut.

Camping and home backup pull in opposite directions

A power station for camping has to be light enough to carry and big enough for a weekend of small devices. Under about 12kg and around 1kWh covers most trips.

A home backup power station is the opposite trade. Weight stops mattering once it lives in one spot, so spend on capacity and output instead.

If you need both, two smaller units usually beat one heavy compromise.

Expandable or fixed

Expandable units take extra battery packs later, which spreads the cost and lets the system grow with the house.

Fixed units are lighter and simpler. If you know the job and it will not change, fixed is the cheaper answer.