Short answer
Add the battery capacities of the devices you expect to recharge, multiply by the number of refills, then add roughly 20–30% for conversion losses and reserve. For a phone-only weekend, a 10,000–20,000 mAh bank is often practical; laptops and multi-day groups should be planned in watt-hours, output watts and weight—not mAh alone.
For shoppers researching what size power bank for camping, this guide turns watt-hours, device loads, charging losses, solar expectations and airline rules into concrete checks. Documentation gaps are treated as specific uncertainties in the what size power bank for camping decision rather than filled with assumptions.
Build an energy budget before shopping
List each device, its battery watt-hours or mAh and the number of expected charges. Convert mAh comparisons only when voltage is understood. A larger bank is not automatically better once pack weight and recharge time affect the trip.
Output determines what can charge
USB-C Power Delivery wattage matters for tablets, cameras and laptops. Check both the maximum single-port output and how power is divided when multiple ports are active. A high capacity bank with weak output may not support the device you bought it for.
Plan the recharge path
A bank that takes most of a day to refill can be awkward between camps. Match input wattage to the wall charger or vehicle adapter you will carry. Small solar panels are weather- and placement-dependent, so do not count on optimistic peak output for essential communication.
Know the flight boundary
FAA guidance says spare lithium batteries and power banks belong in carry-on baggage. Up to 100 Wh is generally permitted; 101–160 Wh requires airline approval, and larger batteries are prohibited on passenger aircraft. Airlines can apply stricter rules.
Decision checklist
- Total device energy needs
- Add conversion loss and emergency reserve
- Match USB-C output to the largest device
- Check input wattage and recharge time
- Verify Wh marking and airline rules
A mistake specific to this decision
When comparing what size power bank for camping, do not let a bestseller label replace the checks above. Record the requirement for watt-hours, device loads, charging losses, solar expectations and airline rules; then verify that requirement against the exact current U.S. listing, bundle and seller.
Sources and further reading
Published August 25, 2026. Reviewed against the 10 Elites research methodology. No hands-on testing is claimed.