Rank #6 in Best 20000mAh Power Bank: 10 Ranked by Real Charge Counts
Charmast 22.5W 20,000mAh Power Bank, 4 Cables
- Rating
- 4.4
- Ratings
- 4,933
- Rank
- #6
Price and rating as shown on Amazon when we collected them. Both change.
The Charmast C2065 is number 6 in this guide. It is a 20,000mAh lithium polymer power bank with four cables built into the case (USB-C, iPhone, micro-USB and USB-A) plus four more ports, selling at £22.79 with 4.4 stars from 4,933 ratings. In a list where almost no two 20,000mAh banks agree on anything, Charmast's numbers sit in the middle of the range — and one of them does not survive contact with another from the same listing.
The advert claims a 22.5W maximum output and 20W PD/QC over the built-in cables. The same spec block also lists 5 volts and 3 amps, and 5 × 3 comes to 15W, not 22.5W. On capacity, the claim is "up to 4 times" for an iPhone 15 — better than the 3.4 charges claimed by the Baseus further down this guide, and well short of the 7 claimed by the Riapow. The rating count is 4,933, while the breakdown of scores supplied with the listing covers only 100 reviews. Everything on this page is taken from the Amazon listing; we have not tested the bank ourselves.
How those 4,933 ratings break down
An average hides its own shape. This is the spread behind the 4.4 stars.
Specification
Exactly as published on the Amazon listing, field for field.
| Price | £22.79 |
|---|---|
| Rating | 4.4 out of 5, from 4,933 ratings |
| Claimed capacity | 20,000mAh lithium polymer |
| Claimed output | 22.5W max — the same spec block lists 5 volts and 3 amps, which multiply to 15W |
| Claimed full charges | "up to 4 times" for an iPhone 15 |
| Batteries (as listed) | 2 lithium polymer batteries required. (included) |
| Ports (as listed) | "Number of Ports: 6", while the connector field lists 4 built-in cables plus 4 ports |
| Score breakdown (as supplied) | 74 of the 100 reviews shown are 5-star; 7 are 1-star |
What it is up against
The rivals it was ranked against in Best 20000mAh Power Bank: 10 Ranked by Real Charge Counts.
Questions people ask
Does the Charmast C2065 really output 22.5W?
The listing says the USB-A port delivers up to 22.5W and that the built-in USB-C and iPhone cables support 20W PD/QC. Its own spec block lists 5 volts and 3 amps, which multiply to 15W. Both figures appear in the same advert.
How many times will it charge a phone?
The Charmast listing says the 20,000mAh capacity is enough to fully charge an iPhone 15 up to 4 times.
How many devices can it charge at once?
The bullet claims up to 6 devices at once from 4 built-in cables and 4 extra ports. The 'Number of Ports' field says 6, while the connector field lists 4 cables plus 4 ports.
What comes in the box?
Portable charger, travel pouch and user manual.
Does it show the exact battery percentage?
Yes. The listing says an LED screen shows remaining power down to 1%.
How many battery cells does it contain?
The spec field says 2 lithium polymer batteries required, and states they are included.
Comments
Reader comments are not checked against the manufacturer's claims above.
No comments yet
Be the first to add something we missed — a price change, a spec that turned out wrong, or how one of these held up.
Leave a comment
No account needed. Own one of these? Tell other readers how it actually performed.