Watt-hour (Wh)
A unit of energy capacity. A 100 Wh battery delivers 100 watts for one hour, 50 watts for two, etc. The canonical spec for laptop and power-station batteries; airlines cap carry-on at 100 Wh.
Watt-hours measure total energy. Wh = (mAh × V) / 1000. A 5,000 mAh / 7.6 V phone battery is 38 Wh.
Practical reference points
- Smartphone — 14–22 Wh.
- Tablet — 30–45 Wh.
- Ultrabook — 50–80 Wh.
- Gaming laptop — 90–99.9 Wh (limited to stay under FAA carry-on cap).
- Power station — 250–4000+ Wh.
Why Wh beats mAh for cross-device comparison
mAh only makes sense at a known voltage. A 10,000 mAh phone power bank at 3.7 V (37 Wh) is half the energy of a 10,000 mAh laptop battery at 7.4 V (74 Wh). For honest cross-product comparison, always convert to Wh.
How to use Watt-hour (Wh) in a real comparison
A unit of energy capacity. A 100 Wh battery delivers 100 watts for one hour, 50 watts for two, etc. The canonical spec for laptop and power-station batteries; airlines cap carry-on at 100 Wh. In practice, this is most useful as one part of a decision rather than a standalone quality badge. Compare it alongside the workload, room, ecosystem, budget, and ownership constraints that apply to you; the strongest published figure is not automatically the best outcome for every buyer.
What to check next
On vsMars, read together so the value has product-specific context. It is especially relevant in .
Avoid the one-number trap
Manufacturers can describe the same capability under different conditions. Compare like-for-like variants, check the unit and test condition where available, and use a head-to-head page to see whether a measurable difference is material for your own use.
vsMars presents structured catalog values to make trade-offs legible. The linked product and spec pages are the right place to inspect the underlying values before buying.