Power Bank vs Power Station: Do the Watt-Hour Math First

The question that settles it

The arithmetic, in one paragraph

A phone charge is roughly 15 to 20 watt-hours. A headlamp battery is a few Wh. A camera battery is a handful. A tablet is 30 to 40 Wh. So a family of four charging phones once a day for a weekend needs somewhere around 120 to 160 Wh in total, plus a margin.

An Anker 737 Power Bank publishes 24,000 mAh / 86.4 Wh. A BioLite Charge 80 PD publishes 20,000 mAh. Two of either, or one plus a solar panel, covers that weekend comfortably — at a combined weight of around 2 lb rather than the 8 to 10 lb of a power station.

Where mAh and Wh diverge

Power banks are advertised in milliamp-hours, power stations in watt-hours, and the two are not directly comparable unless you know the voltage. Watt-hours are mAh multiplied by the cell voltage, divided by 1,000; lithium cells are nominally 3.6 to 3.7 V.

Anker publishes both figures for the 737 — 24,000 mAh and 86.4 Wh — which is the honest way to do it, and 86.4 Wh is also deliberately just under the 100 Wh threshold airlines generally allow in carry-on baggage without approval. When a maker publishes only mAh, do the conversion before comparing, or you will conclude a 20,000 mAh bank is a fifth of a 100,000 mAh station when it is closer to a fifth of a 250 Wh one.

Where the power bank wins

• Weight and bulk. BioLite publishes 1 lb 1 oz and 8.7 by 3.1 by 0.94 in for the Charge 80 PD. That fits in a jacket pocket; a power station does not fit in a pack at all.
• Air travel. Under 100 Wh, a bank generally travels in carry-on. Power stations essentially never do.
• Recharging. Any USB charger fills a bank. BioLite publishes about 4 hours via USB-C PD input; Anker publishes 140 W bi-directional input on the 737, which refills it remarkably quickly.
• Redundancy. Two small banks are more useful than one big one, because they charge two things in two places and one failing does not end the trip.

Where the power station wins

• AC output. The one thing a bank cannot do. Anything with a wall plug needs a station.
• 12V DC. Fridges, tire inflators and vehicle accessories run from a 12V socket, which power banks do not have.
• Simultaneous charging. A family of four charging at once, plus lights, plus a camera, without queuing.
• Solar input. Stations take a 100 W panel directly and store the day's output. Most power banks do not.
• Medical equipment. A CPAP is a power station requirement, full stop, and the sizing needs doing carefully against the machine's own published draw.

Lithium in the cold

Both types lose capacity as temperature drops, and the effect is significant enough to plan around. BioLite publishes an operating range of -4 F to 104 F for the Charge 80 PD, which is the sort of figure worth checking on any battery you intend to use in autumn or winter.

The practical fix is the same for both: keep the battery warm rather than expecting it to perform cold. A power bank spends the night in the sleeping bag; a power station lives in the car or the tent rather than on the ground outside. The same principle applies to headlamp and lantern batteries, in rechargeable vs battery camping lights.

What most families should actually buy

For campground weekends where the car is present: one large power bank per adult, and charge them from the car on the drive. That covers phones, lights and cameras indefinitely at almost no weight, and the car is the power station.

Buy the station when you have a specific AC or 12V load, when you camp for four nights or more without driving anywhere, or when you are pairing it with solar for genuinely off-grid trips. Buying one first, before you know the load, is how people end up with an 8 lb box that charges phones. The full lighting and power system is in the lantern roundup, and the string lights that draw almost nothing are in best camping string lights.