Power Banks

Power Banks in South Africa

Smartphone Shop stocks power banks from Xiaomi and Riversong, from 5,000mAh up to 20,000mAh, including magnetic units that clip to the back of a modern phone. The prices shown on the product cards above are live. They update as stock and exchange rates change, so what you see there is always the current price.

Smartphone Shop has sold online since 2010 and holds a 4.9 rating across 126 Google reviews. Every unit carries a one year manufacturing warranty, and if it is not right when it arrives we arrange and pay for the courier to bring it back.

What mAh Actually Means, and Why You Get Fewer Charges Than the Number Suggests

This is the part almost nobody selling power banks will tell you, and it is the reason people feel short-changed.

A 10,000mAh power bank does not put 10,000mAh into your phone. Moving power from one battery to another loses energy as heat, and the internal voltage conversion loses more. In practice you get roughly 60 to 70 percent of the rated capacity out the other side.

So a 10,000mAh unit delivers somewhere around 6,000 to 7,000mAh of usable charge. Against a phone with a 5,000mAh battery, that is a full charge and a bit, not two.

That is normal, it is physics rather than a fault, and every brand is in the same position. Anyone advertising two full charges from a 10,000mAh bank is counting the label, not the delivery.

Work backwards from your phone instead. Find your handset's battery size on its product page in the cellphone range, then size the bank at roughly double what you want to put back.

Which Power Bank Size to Buy

Capacity	Realistic phone charges	Best for
5,000mAh	About one	A pocket top-up, a day out
10,000mAh	One and a half	The everyday choice for most people
20,000mAh	Three or so	Outages, travel, charging more than one device

The Xiaomi Super Slim Magnetic Power Bank 5000 is the one that genuinely disappears into a pocket. The Xiaomi Mi Power Bank 10000mAh in black is the volume seller and the one we would hand most buyers. The Riversong Vision 20SE 20000mAh is the one to take if you are charging a household rather than a handset.

Bigger is not automatically better. A 20,000mAh unit is heavy, takes most of a day to refill itself, and spends most of its life half full in a drawer. Buy the size you will actually carry.

Buy a Magnetic Power Bank for a Modern Phone

Magnetic banks clip to the back of a phone that supports it and charge without a cable, which changes how you use one. It stops being a thing you plug in at a desk and becomes a thing you stick on and keep using.

The Xiaomi Magnetic Power Bank 10000 with Built-in Stand doubles as a stand, so the phone props up while it charges, which is the detail people end up using most. The slim 5,000mAh magnetic unit above is the same idea in a smaller body.

Two honest caveats. Wireless charging is less efficient than a cable, so you lose more of the rated capacity again. And the magnets hold to a bare phone or a magnet-compatible case, not to every case, so check yours first. Cases and cables sit in cellphone accessories.

Power Banks for Load Shedding

The reason this category sells the way it does in South Africa has nothing to do with travel.

For a scheduled outage, the maths is simple. Two to four hours without power, a phone and maybe a second device to keep alive, and you want to come out the other side without having rationed your screen. A 10,000mAh unit covers one person comfortably. A 20,000mAh unit covers a household, or one person across a day of repeated outages.

The habit matters more than the hardware. A power bank sitting at 20 percent when the lights go out is a paperweight. Charge it the night before, not when the schedule starts.

A bank is not a substitute for a larger power station, and we would rather say so than sell you the wrong thing. It keeps phones, earbuds and a router dongle going. It will not run a television. The Riversong Horizon 05 5000mAh is the sensible second unit to keep in a bag as backup to a larger one.

If the outage also takes your fibre down, a phone on 5G or LTE becomes the household connection, and that phone is then the thing you most need to keep charged. A rugged phone with a large battery is the other way people solve this, and our Ulefone Armor 24 review covers what that actually buys you.

Our piece on battery life in real use covers what heavy daily use actually does to a battery, which applies to the bank as much as the phone.

Fast Charging and What the Watt Number Means

The mAh number tells you how much. The watt number tells you how fast.

The Xiaomi Power Bank 10000mAh 22.5W Lite is the fast charge option here. At 22.5W a modern phone takes a meaningful charge in well under an hour, against several hours on an older 5W or 10W unit.

Your phone has to support the speed as well. A 22.5W bank charging a phone that tops out at 10W charges at 10W. Nothing breaks, you just do not get the benefit, so check the handset before paying for the speed.

Charging habits do more to a battery's lifespan than most people think, and we set the rules out in how to properly charge your device.

Power Bank Prices and What Each Band Buys You

Prices move, so treat these as bands. The live figure is always on the product card above.

Under R500 buys a 5,000mAh unit: one top-up, cable charging, pocket sized.

R500 to R1,000 buys 10,000mAh, faster charging and the magnetic options. This is where most buyers end up.

Above R1,000 buys 20,000mAh, multiple outputs and the ability to charge more than one device at once.

If you are buying a phone at the same time, smartphones under R5,000 is the most searched price band on the site, and the Honor, OPPO and Realme ranges are the three we are asked about most. Mobicred and Payflex let you spread the cost, our piece on buying gadgets on credit explains how both work, and four reasons to avoid a contract sets out why buying outright usually wins.

What Else to Keep Charged

A power bank is rarely bought on its own. Earbuds and headphones and smart watches both live off a case or a cradle that needs topping up, and Huawei watches and bands run a fortnight between charges, which makes them the easiest thing on your wrist to keep alive during an outage.

Tablets draw considerably more than a phone, so size up if you are keeping one going. The Xiaomi range carries the phones alongside these banks, and smart home and gadgets covers the rest.

Latest Arrivals shows what has just landed, and Best Sellers shows what is moving across the whole store.

Buying for a team, a fleet or an office? Our bulk and wholesale page covers pricing and lead times. There is no minimum order quantity.

Frequently Asked Questions

Which is better, 10,000mAh or 20,000mAh?

Neither, they are for different jobs. 10,000mAh is the everyday size: about one and a half phone charges, light enough to carry daily. 20,000mAh is for outages, travel and charging more than one device, but it is heavier and takes most of a day to refill itself. Buy the size you will actually carry rather than the biggest number.

How many times will a power bank charge my phone?

Fewer than the label suggests. Transferring power between batteries loses energy as heat, so you get roughly 60 to 70 percent of the rated capacity out. A 10,000mAh bank delivers around 6,000 to 7,000mAh of usable charge, which against a 5,000mAh phone battery is one full charge and a bit.

What is the best power bank to buy?

The one sized to your phone's battery and light enough that you take it with you. For most South African buyers that is a 10,000mAh unit. Step up to 20,000mAh if you are covering a household through outages, and down to 5,000mAh if it needs to live in a pocket.

What are the disadvantages of a power bank?

Three worth knowing. You lose 30 to 40 percent of the rated capacity to heat and conversion. Larger units are heavy and slow to refill. And a bank left flat is useless when you need it, which is the most common complaint and the easiest to avoid by charging it the night before.

Are power banks good for load shedding?

Yes, for the right job. A power bank will keep phones, earbuds and a router dongle running through a scheduled outage. A 10,000mAh unit covers one person and a 20,000mAh unit covers a household. It will not run a television or a fridge. That needs a power station, which is a different product.

What does the watt number mean?

The mAh number is how much charge a bank holds. The watt number is how fast it delivers it. A 22.5W bank will charge a modern phone in well under an hour where an older 5W unit takes several. Your phone has to support the speed too, so check the handset before paying extra for it.

Can I take a power bank on a plane?

Yes, in your hand luggage, not in checked baggage. South African and international airlines both follow the lithium battery rules, and every unit on this page sits within the capacity limits. Check with your airline before you fly, as the rules are theirs to set.

What warranty do your power banks come with?

Every unit we sell carries a one year manufacturing warranty. It covers defects in materials and workmanship under normal use. It does not cover physical damage, liquid damage or a unit that has been opened. Full terms sit on our Returns and Refunds Policy page.

How much is delivery and can I return it?

We deliver anywhere in South Africa and orders arrive within 1 to 4 working days. The delivery cost is shown at checkout before you pay. Returns are free, we arrange and pay for the courier, and the window is 7 business days.

Last updated: 23 September 2026