Rank #2 in Best 20000mAh Power Bank: 10 Ranked by Real Charge Counts
CUKTECH 45W 20,000mAh Power Bank with USB-C Cable
Price and rating as shown on Amazon when we collected them. Both change.
The CUKTECH 45W Power Bank — model number PB200N, sold on the listing as the CP25 — takes second place in this guide. It pairs 45W output and a built-in USB-C cable with a £24.95 price tag, a claimed 20,000mAh, three ports, 40W input and a 4.4-out-of-5 rating built on 4,036 ratings. CUKTECH says it will charge an iPhone 15 up to 3.9 times, a Samsung S24 Ultra 2.9 times, an iPad Air 1.9 times and a MacBook Air 1.2 times.
The reason it sits second rather than first is not the capacity on the box but the numbers that disagree inside the listing. The spec field gives a battery charge time of 60 minutes; the product bullet, a line away, says that on a fast charger 60 minutes gets the CP25 to 43%. Both cannot describe the same full recharge. The spec field also lists the connector type as USB Type A, while the product name and bullets are built around USB-C — a built-in USB-C cable, USB-C fast charging, and a note telling owners of non-USB-C devices to bring their own cable. Its claimed 3.9 iPhone 15 charges sit near the bottom of the 3.4-to-7 spread in this guide, which is worth knowing when every pack here is sold on the same 20,000mAh headline. Everything on this page comes from the Amazon listing, not from testing we carried out ourselves.
How those 4,036 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 | £24.95 |
|---|---|
| Rating | 4.4 out of 5 from 4,036 ratings |
| Claimed capacity | 20,000mAh |
| Claimed full charges | iPhone 15 up to 3.9 times; Samsung S24 Ultra 2.9 times |
| Output and input | 45W output max; 40W input max |
| Battery charge time | 60 minutes (as listed) |
| Connector type | USB Type A (as listed) |
| Batteries required | 2 Lithium Polymer batteries required (as listed) |
What buyers actually say
Quoted from customer reviews on Amazon
Verified purchase“Don't Misjudge This Budget Gem!I have used the product only once, straight out of the box with a 95% charge.While charging my 5,000 mAh phone, the device suddenly dropped to about 50% and then completed charging the phone, showing 28% remaining.This behaviour is considered normal, as the power bank needs to be charged one or two times from zero to over 100% to calibrate itself for full capacity (it should be more than enough to charge a 5,000 mAh phone twice).Like any power bank, the actual usable capacity is about 65% of the stated capacity (so, approximately 12,000-13,000 mAh in this case), because energy is lost during charging. This is a common characteristic among all power banks.Some inexperienced users may not understand these technical details and underestimate the product.Another important aspect to note is the time required to recharge the power bank itself.It is essential to use a 40-watt charger with a Type-C port to charge the device at full speed.With the correct wattage, it should take about one hour to reach 45% capacity and around two hours to reach 85-90%.The final 10-15% will take an additional half hour, as the charging speed slows down for safety reasons.If the power bank is plugged into a lower-wattage wall socket, it could take approximately 10 hours to fully charge. Many users are unaware of these instructions.The notion that the product is heavy is inaccurate.It actually weighs less than the average weight of two 10,000 mAh power banks altogether.Furthermore, it can charge itself in the same time as a 30-watt 10,000 mAh device (100% in 2 1/2 hours).The 40-watt capacity makes a significant difference.In comparison, a 10,000 mAh device with a maximum input of 22.5 Watts (as most power banks are rated) will take 4 hours 30 minutes to fully charge.”
Verified purchase“very nice, weighs a bit but I sort of expected that, and it does act charge super fast, since its a large powerbank it does take some time to reach its full charge but it lasts for so long, I was able to charge my phone about 3 and a half times to full”
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
How many times can the CUKTECH CP25 charge a phone?
The listing claims up to 3.9 full charges for an iPhone 15, 2.9 for a Samsung S24 Ultra, 1.9 for an iPad Air and 1.2 for a MacBook Air.
How long does the CUKTECH CP25 take to recharge?
The listing gives two different answers. The spec field says a battery charge time of 60 minutes, while the product bullet says that on a fast charger 60 minutes reaches 43%.
Does the CUKTECH CP25 have a built-in cable?
Yes. CUKTECH says the CP25 has a built-in USB-C cable, and notes that devices without a USB-C connector need to use their own cable.
What connector type does the CUKTECH CP25 use?
The spec field lists USB Type A, while the product name and bullets describe USB-C fast charging and a built-in USB-C cable.
Can the CUKTECH CP25 charge small devices?
Yes. CUKTECH says it charges AirPods, Bluetooth headsets, fitness trackers and smart watches, which it states most power banks cannot do.
What warranty does the CUKTECH CP25 come with?
The listing states a 24-month product warranty and lists CE, CB, FCC SDoC, NRTL, Chemical and Energy Efficiency certifications.
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