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THE NOMAD NOTEBOOK · GUIDE 02 / 03

5K, 10K or 20K?
Finding your reserve.

Understanding 5,000, 10,000 and 20,000 mAh batteries, comparing their energy in Wh and estimating recharges according to your uses.

Go to the markers
CAPACITY / ENERGY / BATTERY LIFE
5K / 10K / 20KFIG. 02

THE OBJECTS OF THE GUIDE

The reserve takes shape.

Two ways to carry 10K, and a 20K for days that run long.

02 / KEEPING A RESERVE

Battery life,
at your own pace.

mAh speak of capacity.
They do not say how fast you recharge.

5,000 mAh≈ 18.5 What 3.7 V nominal

5K

POCKET · MINI SLING

The little backup.

To finish the day, find your way or extend a walk. The format you really keep on you.

≈ ½ to 1 phone recharge*

10,000 mAh≈ 37 What 3.7 V nominal

10K

SLING · EVERYDAY BAG

The happy medium.

A reserve for the phone and small accessories. A good starting point for a day far from sockets.

≈ 1 to 2 phone recharges*

20,000 mAh≈ 74 What 3.7 V nominal

20K

BACKPACK · TRAVEL

Seeing a little further.

For long days, journeys and several devices. A computer is conceivable if the USB-C output is powerful enough.

≈ 2 to 4 phone recharges*

* Orders of magnitude wired for a 4,000 to 5,000 mAh phone. The cell voltage, losses, the battery's state and the phone's use change the result. Wireless generally reduces the useful reserve.

THE MARKER TO READ: Wh

Comparing energy, not just mAh.

Wh = (mAh ÷ 1,000) × nominal voltage. A 10K battery at 3.7 V thus stores 37 Wh, before losses. Read the value in Wh printed on the product: the nominal voltage can vary.

AN EXAMPLE, NOT A PROMISE

37 Wh × 70 % ÷ 19 Wh ≈ 1,4

With an assumed overall efficiency of 70% and a 19 Wh phone, we get about 1.4 recharges. Simply dividing the mAh by each other forgets these differences.

NOTE 02

A 20K is not necessarily made for a computer.

It can have a lot of reserve and an output limited to 20 W. For a laptop, you need both enough energy in Wh and a suitable USB-C PD output in watts. The input indicates the speed at which the battery itself can recharge.

Explore power

CAPACITY + POWER · 24,000 mAh / 140 W

Anker · 737 Power Bank

The 737 combines a 24K reserve with stated power up to 140 W. Two figures to read separately: one speaks of stored energy, the other of the charging ceiling. The laptop and the cable must also be compatible.

See the page

Understanding a little.
Carrying just enough.

Composing your everyday life