What Size Power Bank Do I Need? (Capacity Guide 2026)
Match capacity to your routine. For a light daily top-up, around 5,000 mAh is pocketable and enough for roughly one charge. For most people — a reliable all-rounder, around 10,000 mAh gives one to two charges with a good size-to-capacity balance. For travel, multiple devices, or charging a tablet, go 20,000 mAh or more, accepting the extra weight and bulk. Bigger is not automatically better — a large power bank you find too heavy to carry helps less than a medium one you actually bring. And remember you get somewhat less than the rated mAh into your device.
Size is about your routine, not the biggest number
The right size depends on how and where you'll use it. More capacity means more charges but more weight, bulk, and cost — and a longer time to recharge the power bank itself. Pick the smallest size that comfortably covers your real need, so you actually carry it.
Match the size to how you'll use it
Light daily top-up (~5,000 mAh). Pocketable and light, roughly one phone charge. Great if you just want insurance for a phone that dips low by evening. Easy to carry every day.
The all-rounder (~10,000 mAh). The popular choice — usually one to two full charges, still reasonably portable. If you're unsure, this is the safe pick for most people: enough for a long day out, load-shedding, or a commute, without being a brick.
Travel / heavy / multi-device (20,000 mAh+). Multiple charges, can top up tablets and some laptops, good for trips, long days off-grid, or charging several devices. The trade-off is real weight and bulk, and a longer recharge time — better thrown in a bag than carried in a pocket.
Size by use
| Use | Capacity | Trade-off |
|---|---|---|
| Daily top-up, pocket carry | ~5,000 mAh | Fewer charges |
| One reliable all-rounder | ~10,000 mAh | Balanced — best default |
| Travel / tablet / multi-device | 20,000 mAh+ | Heavier, bulkier, slower to recharge |
Things that change the size you need
- Your phone's battery size. A phone with a big battery takes more out of the power bank per charge, so you may want more capacity for the same number of charges.
- How many devices. Charging a phone plus earbuds plus a watch needs more capacity (and enough ports).
- Tablets and laptops. These need much more capacity (and higher output) than phones — push toward the large end.
- Real vs rated capacity. You always get somewhat less than the label into your device, so don't size right to the edge — leave a margin.
The honest recommendation
If you want one power bank and don't want to overthink it, around 10,000 mAh suits most people: enough charges for a long day, still portable, not too slow to recharge. Step down to ~5,000 mAh only if pocketability matters most, and up to 20,000 mAh+ only if you genuinely need travel-grade capacity or to charge bigger devices. Buy a genuine unit with warranty — a fake "huge capacity" power bank rarely delivers its claim.
What to do next
- Want the full process? Read how to choose a power bank in Nepal.
- Confused by the numbers? See power bank specs explained.
- Flying? Read can you take a power bank on a plane.
Evergreen guide, reviewed as battery sizes and needs change.
Frequently asked questions
For most people, yes u2014 around 10,000 mAh usually gives one to two full phone charges with a good balance of size and weight, making it the popular all-rounder choice. It comfortably covers a long day out, a commute, or load-shedding. Step up to 20,000 mAh or more only if you need multiple charges, travel-grade capacity, or to charge a tablet or laptop.
Only if you genuinely need lots of capacity u2014 multiple charges, several devices, travel where you're off-grid, or charging a tablet or some laptops. The trade-off is real weight and bulk, plus a longer time to recharge the power bank itself. For everyday phone top-ups, around 10,000 mAh is usually plenty and far more pocketable.
Yes u2014 more mAh means more charges, but remember you get somewhat less than the rated capacity into your device because energy is lost in conversion. A phone with a large battery also takes more per charge, so the same power bank gives fewer charges of a big-battery phone than a small-battery one. Size with a margin rather than right to the edge.
For travel, larger capacity (often 20,000 mAh or more) makes sense so you can recharge multiple times or several devices when sockets are scarce. Accept the extra weight and bulk, and note airline rules limit power bank capacity for flights u2014 check before flying. For shorter trips with regular access to sockets, a 10,000 mAh all-rounder may be enough and far lighter.
Because bigger means heavier, bulkier, pricier, and slower to recharge u2014 and a large power bank you find too cumbersome to carry helps less than a medium one you actually bring. Match capacity to your real routine. For most people a 10,000 mAh all-rounder is the sweet spot; only go large if you truly need travel-grade capacity or to charge bigger devices.
Ready to choose a power bank?
Compare real power banks prices in Nepal — official vs market, verified seller offers, warranty and stock.