Calculators
amazon.co.uk
Laptop power banks
price per 100 Wh How we compare Buying guide ↓
- Output that matters
- 65–140 W on one port
- Cable above 60 W
- 5 A e-marked; EPR at 140 W
- Carry-on without approval
- Up to 100 Wh · 27,000 mAh
- Charges, 74–100 Wh bank
- One 13-inch, half a 16-inch
Filters (1)
| Product | £ / 100 Wh ▲ | Max output (W) | Package | Capacity | Kind | Rating · Reviews |
|---|
| Product | £ / 100 Wh ▲ | Max output (W) | Package | Capacity | Kind | Rating · Reviews | |
|---|---|---|---|---|---|---|---|
| 65W Power Bank 42800mAh Laptop Fast Charging Built in Cables USB C Battery 42,800 mAh · 158.4 Wh · 4.5 / 5 Max output (W): 65 Capacity, output & details
| £18.24per 100 WhBest value | 65 | £28.89Package price | 42,800 mAh · 158.4 Wh | Laptop (65 W+) | 4.5 (2) | |
| Laptop Power Bank 42800mAh, 65W Fast Charging Battery Pack 42,800 mAh · 158.4 Wh Max output (W): 65 Capacity, output & details
| £29.04per 100 Wh | 65 | £45.99Package price | 42,800 mAh · 158.4 Wh | Laptop (65 W+) | — | |
| 65W Power Bank 40000mAh Laptop Portable Charger PD Fast USB C Cable Pack 40,000 mAh · 148 Wh · 5 / 5 Max output (W): 65 Capacity, output & details
| £29.05per 100 Wh | 65 | £42.99Package price | 40,000 mAh · 148 Wh | Laptop (65 W+) | 5 (2) | |
| CUKTECH 100W Power Bank 25,000mAh, Dual-Way Fast Charging & Triple Charging Ports, Digital Display for Laptops, iPhone 15, MacBook Pro with 9-Fold Safety Protection 25,000 mAh · 92.5 Wh · 4.5 / 5 Max output (W): 100Most powerful Capacity, output & details
| £43.22per 100 Wh | 100Most powerful | £39.98Package price | 25,000 mAh · 92.5 Wh | Laptop (65 W+) | 4.5 (179) | |
| Hichain Laptop Power Bank 65W 20000mAh Portable Charger with Built-in USB-C Cable, 3-Port Fast Charging Battery Pack for MacBook iPhone 17 16/15 Series Android Switch Travel Essential Silver 20,000 mAh · 74 Wh · 4.2 / 5 Max output (W): 65 Capacity, output & details
| £43.23per 100 Wh | 65 | £31.99Package price | 20,000 mAh · 74 Wh | Laptop (65 W+) | 4.2 (266) | |
| Hichain Laptop Power Bank 65W Laptop Portable Charger 20000mAh Battery Pack Fast Charging with USB C Cable, Phone Charger for iPhone 17/16/15/14/13 All Series/Samsung/Android, Camping Essential, Blue 20,000 mAh · 74 Wh · 4.2 / 5 Max output (W): 65 Capacity, output & details
| £43.23per 100 Wh | 65 | £31.99Package price | 20,000 mAh · 74 Wh | Laptop (65 W+) | 4.2 (266) | |
| NOBIS Portable Charger 20000mAh 65W Power Bank Fast Charging 20,000 mAh · 74 Wh · 4.5 / 5 Max output (W): 65 Capacity, output & details
| £45.93per 100 Wh | 65 | £33.99Package price | 20,000 mAh · 74 Wh | Laptop (65 W+) | 4.5 (1k) | |
| JUOVI 65W Power Bank Fast Charging 20000mAh 20,000 mAh · 74 Wh · 4.5 / 5 Max output (W): 65 Capacity, output & details
| £45.93per 100 Wh | 65 | £33.99Package price | 20,000 mAh · 74 Wh | Laptop (65 W+) | 4.5 (990) | |
| JUOVI 65W Power Bank Fast Charging 20000mAh 20,000 mAh · 74 Wh · 4.5 / 5 Max output (W): 65 Capacity, output & details
| £45.93per 100 Wh | 65 | £33.99Package price | 20,000 mAh · 74 Wh | Laptop (65 W+) | 4.5 (990) | |
| NOBIS 65W Power Bank Fast Charging 20000mAh Portable Charger 20,000 mAh · 74 Wh · 4.4 / 5 Max output (W): 65 Capacity, output & details
| £45.93per 100 Wh | 65 | £33.99Package price | 20,000 mAh · 74 Wh | Laptop (65 W+) | 4.4 (626) | |
| JUOVI 65W Power Bank Fast Charging 20000mAh 20,000 mAh · 74 Wh · 4.5 / 5 Max output (W): 65 Capacity, output & details
| £45.93per 100 Wh | 65 | £33.99Package price | 20,000 mAh · 74 Wh | Laptop (65 W+) | 4.5 (990) | |
| UGREEN Nexode 67W 20000mAh Power Bank 3-Way Output Built-in USB C Cable 20,000 mAh · 74 Wh · 4.6 / 5 Max output (W): 67 Capacity, output & details
| £46.57per 100 Wh | 67 | £34.46Package price | 20,000 mAh · 74 Wh | Laptop (65 W+) | 4.6 (1.2k) | |
| JUOVI Power Bank 65W 20000mAh Portable Charger Fast Charging 20,000 mAh · 74 Wh · 4.4 / 5 Max output (W): 65 Capacity, output & details
| £47.08per 100 Wh | 65 | £34.84Package price | 20,000 mAh · 74 Wh | Laptop (65 W+) | 4.4 (1k) | |
| INIU Power Bank, 100W 25000mAh Portable Charger Fast Charging USB C Input & Output for Laptop and Phones Battery Pack, Powerbank for iPhone 15 14 13 12 Pro Max Mini Plus Samsung Steam Deck iPad etc 25,000 mAh · 92.5 Wh · 4.2 / 5 Max output (W): 100Most powerful Capacity, output & details
| £47.82per 100 Wh | 100Most powerful | £44.23Package price | 25,000 mAh · 92.5 Wh | Laptop (65 W+) | 4.2 (5.5k) | |
| JUOVI Power Bank 65W 20000mAh Portable Charger Fast Charging 20,000 mAh · 74 Wh · 4.4 / 5 Max output (W): 65 Capacity, output & details
| £48.64per 100 Wh | 65 | £35.99Package price | 20,000 mAh · 74 Wh | Laptop (65 W+) | 4.4 (1k) | |
| NOBIS Portable Charger 20000mAh 65W Power Bank w/Detachable Cable 20,000 mAh · 74 Wh · 4.6 / 5 Max output (W): 65 Capacity, output & details
| £49.38per 100 Wh | 65 | £36.54Package price | 20,000 mAh · 74 Wh | Laptop (65 W+) | 4.6 (237) | |
| NOBIS Portable Charger 20000mAh 65W Power Bank w/Detachable Cable 20,000 mAh · 74 Wh · 4.6 / 5 Max output (W): 65 Capacity, output & details
| £49.38per 100 Wh | 65 | £36.54Package price | 20,000 mAh · 74 Wh | Laptop (65 W+) | 4.6 (237) | |
| INIU Laptop Power Bank, Compact 20000mAh 65W Fast Charging Battery Pack 20,000 mAh · 74 Wh · 4.3 / 5 Max output (W): 65 Capacity, output & details
| £54.04per 100 Wh | 65 | £39.99Package price | 20,000 mAh · 74 Wh | Laptop (65 W+) | 4.3 (2.4k) | |
| Anker Power Bank, 20,000mAh 87W Portable Charger with Built-In USB-C Cable 20,000 mAh · 74 Wh · 4.6 / 5 Max output (W): 87 Capacity, output & details
| £54.04per 100 Wh | 87 | £39.99Package price | 20,000 mAh · 74 Wh | Laptop (65 W+) | 4.6 (10.2k) | |
| AsperX Laptop Power Bank, 20,000mAh 100W PD 3.0 Fast Charging for MacBook 20,000 mAh · 74 Wh · 5 / 5 Max output (W): 100Most powerful Capacity, output & details
| £54.04per 100 Wh | 100Most powerful | £39.99Package price | 20,000 mAh · 74 Wh | Laptop (65 W+) | 5 (3) | |
| 27000mAh Laptop Power Bank 100W, USB-C Fast Charging Portable Charger with 2 USB-C & USB-A Ports for MacBook, iPad, iPhone & Samsung – Grey 27,000 mAh · 99.9 Wh Max output (W): 100Most powerful Capacity, output & details
| £55.05per 100 Wh | 100Most powerful | £54.99Package price | 27,000 mAh · 99.9 Wh | Laptop (65 W+) | — | |
| INIU Laptop Power Bank, Smallest 20000mAh 65W Fast Charging Battery Pack 20,000 mAh · 74 Wh · 4.4 / 5 Max output (W): 65 Capacity, output & details
| £57.15per 100 Wh | 65 | £42.29Package price | 20,000 mAh · 74 Wh | Laptop (65 W+) | 4.4 (818) | |
| UGREEN Nexode 100W 20000mAh 3-Port USB-C Power Bank 20,000 mAh · 74 Wh · 4.5 / 5 Max output (W): 100Most powerful Capacity, output & details
| £60.77per 100 Wh | 100Most powerful | £44.97Package price | 20,000 mAh · 74 Wh | Laptop (65 W+) | 4.5 (5.6k) | |
| JUOVI Power Bank 90W 20000mAh PD QC Fast Charging Portable Charger 20,000 mAh · 74 Wh · 4.2 / 5 Max output (W): 90 Capacity, output & details
| £60.86per 100 Wh | 90 | £45.04Package price | 20,000 mAh · 74 Wh | Laptop (65 W+) | 4.2 (187) | |
| CUKTECH Power Bank 15000mAh 100W, External Battery Fast Charging, Portable Charger with Display, Compatible with iPad, iPhone 16/15 Plus Pro MAX, Galaxy S24 S23 Ultra 15,000 mAh · 55.5 Wh · 4.6 / 5 Max output (W): 100Most powerful Capacity, output & details
| £61.24per 100 Wh | 100Most powerful | £33.99Package price | 15,000 mAh · 55.5 Wh | Laptop (65 W+) | 4.6 (144) | |
| JUOVI Power Bank 90W 20000mAh Portable Charger with Detachable Cable 20,000 mAh · 74 Wh · 4.8 / 5 Max output (W): 90 Capacity, output & details
| £63.16per 100 Wh | 90 | £46.74Package price | 20,000 mAh · 74 Wh | Laptop (65 W+) | 4.8 (142) | |
| INIU Laptop Power Bank, Smallest 25000mAh 100W Fast Charging Battery Pack 25,000 mAh · 92.5 Wh · 4.2 / 5 Max output (W): 100Most powerful Capacity, output & details
| £63.31per 100 Wh | 100Most powerful | £58.56Package price | 25,000 mAh · 92.5 Wh | Laptop (65 W+) | 4.2 (5.5k) | |
| Anker Power Bank, 20,000mAh 87W Portable Charger with Built-In USB-C Cable 20,000 mAh · 74 Wh · 4.6 / 5 Max output (W): 87 Capacity, output & details
| £67.55per 100 Wh | 87 | £49.99Package price | 20,000 mAh · 74 Wh | Laptop (65 W+) | 4.6 (10.2k) | |
| JUOVI 90W Laptop Power Bank Fast Charging 20000mAh 20,000 mAh · 74 Wh · 4.2 / 5 Max output (W): 90 Capacity, output & details
| £67.55per 100 Wh | 90 | £49.99Package price | 20,000 mAh · 74 Wh | Laptop (65 W+) | 4.2 (237) | |
| NOBIS Power Bank 90W 20000mAh Laptop Portable Charger 20,000 mAh · 74 Wh · 4.5 / 5 Max output (W): 90 Capacity, output & details
| £67.55per 100 Wh | 90 | £49.99Package price | 20,000 mAh · 74 Wh | Laptop (65 W+) | 4.5 (226) | |
| NOBIS Power Bank 90W 20000mAh Laptop Portable Charger 20,000 mAh · 74 Wh · 4.5 / 5 Max output (W): 90 Capacity, output & details
| £67.55per 100 Wh | 90 | £49.99Package price | 20,000 mAh · 74 Wh | Laptop (65 W+) | 4.5 (226) | |
| CUKTECH 10 Power Bank 100W Laptop Portable Charger, 10000mAh Battery Pack USB C with Smart TFT Display, PD3.0 Fast Charging for iPhone 16/15 Series, Samsung Galaxy S24/S23, iPad Air/Pro, MacBook, Dell 10,000 mAh · 37 Wh · 4.4 / 5 Max output (W): 100Most powerful Capacity, output & details
| £68.89per 100 Wh | 100Most powerful | £25.49Package price | 10,000 mAh · 37 Wh | Laptop (65 W+) | 4.4 (273) | |
| INIU 100W Power Bank, Mini Size 25000mAh High Capacity Laptop Portable Charger, USB C in&Out Tablet Powerbank, Smart Digital Display Phone Charger for iPhone 16 15, Samsung, iPad, MacBook, Laptop etc. 25,000 mAh · 92.5 Wh · 4.2 / 5 Max output (W): 100Most powerful Capacity, output & details
| £71.02per 100 Wh | 100Most powerful | £65.69Package price | 25,000 mAh · 92.5 Wh | Laptop (65 W+) | 4.2 (5.5k) | |
| JUOVI 90W Power Bank 20000mAh with Detachable USB C Cable 20,000 mAh · 74 Wh · 4.5 / 5 Max output (W): 90 Capacity, output & details
| £71.61per 100 Wh | 90 | £52.99Package price | 20,000 mAh · 74 Wh | Laptop (65 W+) | 4.5 (123) | |
| Portable Laptop Power Bank, 27000mAh 100W AC Laptop Charger, PD 65W Dual-Way Fast Charging External Battery Pack for MacBook Air iPad iPhone Dash Cam Camping Travelling-N22 27,000 mAh · 99.9 Wh · 3.4 / 5 Max output (W): 100Most powerful Capacity, output & details
| £74.06per 100 Wh | 100Most powerful | £73.99Package price | 27,000 mAh · 99.9 Wh | Laptop (65 W+) | 3.4 (28) | |
| INIU Laptop Power Bank, 25000mAh 100W Battery Pack, Red 25,000 mAh · 92.5 Wh · 4.3 / 5 Max output (W): 100Most powerful Capacity, output & details
| £75.66per 100 Wh | 100Most powerful | £69.99Package price | 25,000 mAh · 92.5 Wh | Laptop (65 W+) | 4.3 (176) | |
| Portable Laptop Power Bank, Universal 98Wh/27000mAh 100W AC Outlet with 65W PD USB C Portable Charger, External Battery Pack for MacBook, Notebooks, Laptops,N2 27,000 mAh · 98 Wh · 3.8 / 5 Max output (W): 100Most powerful Capacity, output & details
| £76.52per 100 Wh | 100Most powerful | £74.99Package price | 27,000 mAh · 98 Wh | Laptop (65 W+) | 3.8 (65) | |
| AC Laptop Power Bank, Universal 27000mAh 100W Travel Laptop Charger, PD 65W Dual-Way Fast Charging External Battery Pack for Business Travel Outdoor Camping Home Emergency Outage, P2 27,000 mAh · 99.9 Wh · 4.2 / 5 Max output (W): 100Most powerful Capacity, output & details
| £79.07per 100 Wh | 100Most powerful | £78.99Package price | 27,000 mAh · 99.9 Wh | Laptop (65 W+) | 4.2 (17) | |
| Belkin BoostCharge 20000mAh 65W Laptop Power Bank with USB-C & USB-A Ports 20,000 mAh · 74 Wh · 4.2 / 5 Max output (W): 65 Capacity, output & details
| £81.07per 100 Wh | 65 | £59.99Package price | 20,000 mAh · 74 Wh | Laptop (65 W+) | 4.2 (330) | |
| Laptop Power Bank with AC Outlet, 27000mAh 100W Portabale External Battery Pack, PD 65W Dual-Way Fast Charging Laptop Charger Battery for Business Travel Outdoor Camping Home Emergency Outage 27,000 mAh · 99.9 Wh · 4 / 5 Max output (W): 100Most powerful Capacity, output & details
| £81.07per 100 Wh | 100Most powerful | £80.99Package price | 27,000 mAh · 99.9 Wh | Laptop (65 W+) | 4 (80) | |
| UGREEN Nexode 100W 12000mAh Power Bank Smart Digital Display 12,000 mAh · 44.4 Wh · 4.4 / 5 Max output (W): 100Most powerful Capacity, output & details
| £85.56per 100 Wh | 100Most powerful | £37.99Package price | 12,000 mAh · 44.4 Wh | Laptop (65 W+) | 4.4 (754) | |
| SMALLRIG Nano72 Power Bank for Camera, 20000mAh PD100W USB-C VMount Battery 20,000 mAh · 74 Wh · 4.5 / 5 Max output (W): 100Most powerful Capacity, output & details
| £98.51per 100 Wh | 100Most powerful | £72.90Package price | 20,000 mAh · 74 Wh | Laptop (65 W+) | 4.5 (21) | |
| 60000mAh Laptop Power Bank USB C 65W, Fast Charging 22.5W in/Output Portable Charger with LED Flashlight, High Capacity Battery Pack for iPad, Samsung, Travel, Camping, Hiking — · 4.2 / 5 Capacity, output & details
| —per 100 Wh | — | £48.99Package price | — | Laptop (65 W+) | 4.2 (209) | |
| Power Bank 70000mAh 100W Fast Charging for Laptop, PowerBank USB C with Built-in Retractable Cable, Portable Charger for Camping, Battery Pack Compatible with Tablets Laptop iPhone Samsung — · 3.2 / 5 Capacity, output & details
| —per 100 Wh | — | £32.29Package price | — | Laptop (65 W+) | 3.2 (34) |
£67.55 per 100 Wh median of 93 in-stock listings.
Per 100 Wh of nominal cell energy: mAh × 3.7 V, or the stated Wh where it agrees within 20 %; power stations by their stated Wh. ~ marks a stated Wh set aside, or a title that names several capacities.
Laptop power banks: what to know before you buy
A 20,000–27,000 mAh bank with at least one USB-C port that negotiates USB Power Delivery at 65 W or more; 100 W and 140 W are the common ceilings, and 250–300 W models exist. Buyers get three things wrong: a 74–100 Wh bank is about one charge of a 13-inch laptop and half a charge of a 16-inch one; the laptop’s port, the cable and the bank each cap the speed, so “140 W” on the box rarely reaches the laptop; and the bank’s own input speed decides whether it refills over lunch or overnight.
Specs and terms that matter
Output per port and combined
65, 100 or 140 W on the main USB-C port is the figure that matters; a combined figure such as “165 W” is often 100 W on one port plus 65 W on another, never 165 W to one laptop. Most banks drop the laptop port to a lower profile when a phone is plugged in too.
PD 3.0 vs PD 3.1 EPR
USB PD 3.0 tops out at 100 W (20 V, 5 A). PD 3.1 Extended Power Range adds 28, 36 and 48 V for up to 240 W; 140 W needs the 28 V EPR profile on bank, cable and laptop alike. PPS and AVS are the adjustable-voltage modes for phones and newer laptops.
Cable rating
Any USB-C cable carries 3 A, 60 W at 20 V. Above 60 W the cable must be 5 A e-marked (sold as “100 W”); 140–240 W needs an EPR-marked 5 A cable. A 100 W bank with a thin cable charges a laptop at 60 W, and users with a USB tester often find half their cables are the slow kind.
Input watts (recharge)
65 W input refills a 100 Wh bank in about 2 h, 100–140 W in about 1 h; some banks take two chargers at once. The input rating needs a wall charger and cable that can supply it. A crowd-sourced test of ten laptop banks found a 20-minute lunch recharge returns about 45 Wh at best, because most throttle after 20 minutes at 140 W.
Energy
20,000 mAh is 74 Wh, 24,000–26,000 mAh 86–96 Wh, 27,000 mAh about 100 Wh. Above 100 Wh airline approval is needed, which is why laptop banks cluster at 24,000–27,000 mAh.
Sustained vs peak output
Some banks hold the top figure for five minutes, then throttle on heat; reviews that log the curve show it. Voltage ripple and noise under load separate good electronics from poor ones.
Weight
500–700 g is normal for 25,000 mAh at 140–165 W; the lightest 20,000 mAh banks are about 325 g but at lower watts. A 300 W 27,000 mAh bank is 600–700 g.
Display and ports
A live watts-in and watts-out display is standard here; it shows whether the laptop negotiated 65 or 100 W. Two USB-C and one USB-A is the norm, a third USB-C on 25,000 mAh and up; Bluetooth telemetry on premium models.
Before you buy
- Find the laptop’s draw: a MacBook Air or 13-inch ultrabook 30–65 W, a 14-inch MacBook Pro 70–96 W, a 16-inch MacBook Pro 140 W over its MagSafe 3 cable; most gaming laptops charge from USB-C slowly or not at all.
- Decide between 65 and 100 W: in forum consensus 65 W keeps a MacBook Pro working under normal load and 100 W keeps it charging under load.
- Check the cable in the box: 5 A e-marked for anything above 60 W, EPR-marked for 140 W; buy one if the box does not say.
- Read the input watts and whether the wall charger at home can supply them; 140 W input needs a 140 W charger and an EPR cable.
- Keep the Wh under 100 if the bank will fly: 24,000–27,000 mAh is the usual ceiling, and 30,000 mAh laptop banks need airline approval.
- Weigh it against the charger: a bank that weighs more than the laptop’s charger loses to a charger plus a 10,000 mAh bank in most travel threads.
- Check whether the laptop port holds its output when a phone is plugged in; the per-port figures under load are in the fine print.
- Check the model number against the maker’s recall page and read the warranty term, 12–24 months on this class.
Myths and mistakes
- A 140 W bank does not charge a 16-inch MacBook Pro at 140 W over USB-C: that speed uses the MagSafe 3 cable, USB-C stays at the 100 W PD 3.0 ceiling, and the Mac’s own curve falls below 100 W after about 22 minutes anyway.
- A 100 Wh bank does not fully recharge every laptop: about 85 Wh arrives, roughly 1.2 charges of a MacBook Air and 0.8 of a 16-inch Pro.
- A charger that is also a power bank at 140 W and 20,000 mAh does not exist; the hybrids are 65 W and 10,000 mAh, and bulky in a wall socket.
- “165 W” in a title is a combined figure: 100 W on one port and 65 W on another, never 165 W to a laptop.
- Gaming laptops are not laptop-bank territory: most need 180–240 W from a barrel charger, and a 100 W USB-C bank only slows the drain.
- A 3C mark, not a UL mark, is what China’s Civil Aviation Administration has required on domestic flights since 28 June 2025; travellers transiting China report banks without it being confiscated.
Questions people ask
How many watts does my laptop need from a power bank?
30–65 W for thin laptops and a MacBook Air, 96–100 W for 14- and 16-inch pro models, 140 W only for the 16-inch MacBook Pro over its MagSafe 3 cable. A laptop draws what it needs; a 100 W bank on a 45 W laptop runs at 45 W.
Will a 65 W power bank charge a 100 W laptop?
Yes, more slowly; under heavy load the battery may still drain, but the runtime is extended. In forum consensus 65 W keeps a MacBook Pro working under normal load, and 100 W keeps it charging while working.
Which cable do I need for a 100 W or 140 W power bank?
A 5 A e-marked cable (sold as “100 W”) for 65–100 W; a 240 W EPR-marked cable for 140 W. A plain USB-C cable carries 60 W, whatever the bank says.
How much laptop runtime does a 20,000 mAh bank give?
Roughly one full charge of a 13-inch laptop (50–70 Wh battery) and half a charge of a 16-inch one (100 Wh), after 10–15 % losses. A 27,000 mAh bank at about 100 Wh gives about 1.2 charges of a MacBook Air.
Can I fly with a 24,000 or 26,800 mAh laptop power bank?
Yes, in carry-on: both are under 100 Wh (86–99 Wh). A 30,000 mAh bank at 111 Wh needs the airline’s approval, two at most, under the ICAO tiers the FAA and EASA follow. Since 27 March 2026 ICAO’s addendum says the bank should not be used or recharged on board; airlines differ, and the airline’s current rule applies.
How fast does a laptop power bank recharge itself?
About the Wh divided by the input watts: 100 Wh at 65 W in about 2 h, at 140 W in about 1 h, plus the taper at the end. Only with a charger and cable that can supply the input rating.
Does a laptop power bank charge a phone too?
Yes, from its second USB-C or USB-A port. Check whether the laptop port drops its output when both are used; most banks split the total between ports.
Sources: USB Power Delivery: profiles, cables and EPR (reference), ChargerLAB: MacBook Pro 16-inch M4 Pro charging review, FAA PackSafe: lithium batteries, ICAO Technical Instructions 2025–2026, Addendum No. 1 (27 March 2026), CAAC 3C requirement for power banks on domestic flights (Hangzhou government portal). Reviewed 19 Oct 2026. General information compiled from public sources, not safety or legal advice. Airline rules change often; your airline’s current rule is the one that applies.
Work out a price per Wh: free power bank calculators · mAh to Wh calculator