Sell Your Used Power Bank — 0% Fees

A used power bank typically sells for £8 to £35, and on WishThrift it costs you nothing to list — no fee, no commission, so you keep the whole amount you agree. Power banks are one of the few electronics where age matters more than use, because the cells degrade whether you use them or not — so give the real capacity you get today.

The short version

Typical range: £8 – £35 — see the full power bank value guide
What decides your price: condition, and how well you evidence it in photographs
Cost to sell here: nothing, at any price
Category: Electronics

Before you photograph it

Ten minutes here is worth more than anything else you will do. Buyers are deciding between your listing and someone else’s, and preparation is what visibly separates the two.

Charge it fully and then use it to charge a device, and note honestly how much it actually delivered.
Check the casing for any swelling, which means a failing cell. A swollen power bank must not be sold or posted.
Note the stated capacity, the output ports and whether it supports fast charging.

The photographs that sell a power bank

Four photographs do almost all the work. Shoot in daylight, near a window, with the item against something plain — and do not use the flash, which flattens texture and hides exactly what buyers are trying to see.

The power bank whole, with its ports visible
The label showing capacity and output ratings
The charge level display or indicator lights
All included cables, plus any scuff, dent or swelling

Photograph the flaws too. It feels counterproductive, but a listing that shows the worst of an item gets fewer questions, fewer withdrawn offers and fewer arguments at handover. Buyers who can see the damage stop imagining something worse.

Writing the title and description

Capacity, output and brand: “Anker 20000mAh Power Bank, 65W USB-C PD”. Capacity in mAh is the search and the wattage matters for anyone charging a laptop. Say how many ports and whether it supports pass-through charging.

Then state these in the description, because a buyer who has to ask is a buyer who might not bother:

Stated capacity in mAh and real delivered capacity as you observed it
Output ports, wattage, and whether it supports fast charging standards
Approximate age and how often it has been cycled
Whether cables are included, and confirmation the casing is not swollen

What buyers will actually ask

You will receive the same three messages about a power bank. Answering them in the listing itself removes the back-and-forth, and answering them well when they do arrive is what turns an enquiry into a sale.

“How much charge does it actually hold now?”

Charge a device from it and report what you got. Stated capacity and delivered capacity differ even when new, and more so with age.

“How old is it?”

Give the real figure. Lithium cells degrade on a calendar as well as with cycles, so a five-year-old bank is tired regardless of use.

“Can it charge a laptop?”

Give the wattage and whether it supports USB-C Power Delivery. It is the difference between a phone topper and something genuinely useful for a laptop.

Pricing it so it actually sells

Start from the honest condition grade rather than the price you hope for. WishThrift listings use five grades — New with Tags, Like New, Good, Fair and For Parts — and what each grade means is worth reading before you choose, because grading up is the most expensive mistake sellers make. It does not raise the price; it produces a buyer who arrives expecting something else.

The power bank value guide prices all five grades for this item. Pick your grade, take the figure, and if you sit between two grades price toward the lower one. Items priced honestly sell faster than items priced hopefully, and on a free platform there is no fee eating the difference anyway.

What you keep, compared

On a £21 sale — roughly the middle of the range for a power bank — here is what the commission-charging platforms would take, and what you would keep on each:

Where you sell it	Fee	You keep
WishThrift	£0	£21
Poshmark	−£4	£17
eBay	−£3	£18
Mercari	−£2	£19
Etsy	−£1	£20

Seller-side rates verified 26 Jul 2026 — Poshmark: 20% commission on sales of $15 and above; eBay: 13.6% final value fee, plus a per-order fee; Mercari: flat 10% selling fee; Etsy: 6.5% transaction fee, plus a listing fee and payment processing. Percentages are applied to the sterling figure above; the fixed per-order and processing charges those platforms add are quoted in their own currency and are not included here, so the real deductions are slightly larger. Full breakdown: marketplace selling fees compared.

Timing and getting it to the buyer

Lifts before summer and Christmas travel. High-wattage USB-C models sell quickly; small old banks are worth very little.

Lithium batteries are restricted on some postal services and refused by others, so check your carrier’s rules before promising postage. Never post a swollen power bank — take it to a battery recycling point instead.

WishThrift does not process payments or arrange delivery — you and the buyer agree both directly — so confirm payment has cleared before the item leaves your hands, and keep the conversation on the site so there is a record of what was agreed.

Ready to list it? It takes about two minutes, costs nothing, and there is no commission when it sells — create a free account or see how selling works.

Frequently asked questions

Can I post a power bank?

It depends on the carrier and the capacity, and rules differ by destination. Check before agreeing to post, and if in doubt sell it for local collection.

What is a used power bank worth?

Typically £8 to £35, with high-capacity fast-charging models above. See the power bank value guide.

Is a swollen power bank dangerous?

Yes. Swelling means a failing lithium cell, which is a genuine fire risk. It must not be sold, posted or kept — take it to a proper battery recycling point.