| Pros | Cons |
|---|---|
| Compact and slim profile | Extremely slow wired charging |
| Integrated kickstand | Runs dangerously hot |
| Budget friendly | Poor recharge efficiency |
| Decent magnetic pull |
This Belkin Qi2-certified 5,000mAh power bank is one of the smallest and slimmest models we’ve tested this year. But behind that sleek exterior lies a laundry list of frustrating limitations, including heat issues, glacial recharge speeds, and throttled wired output.
Looking for the best of the best Qi2 battery banks? Check out our Top 5!
How Do We Test
We don’t just look at specs and call it a day. Every power bank we review goes through a series of real-world and lab-based tests to figure out how it actually performs. Below are the specific tests we run on every Qi2 battery pack before giving it a ranking.
- Real Capacity Testing: We fully discharge each battery pack using calibrated power meters to measure the actual energy (in Wh) delivered to a device. This helps us determine whether the stated capacity is accurate and if not, by how much. It’s the best way to tell if you’re getting what you paid for.
- Wired Charging Performance: We test wired output across all supported PDO (Power Delivery Object) and PPS (Programmable Power Supply) profiles. Using meters and voltage analyzers, we record output stability, voltage drop, and protocol accuracy. Each protocol is scored based on its ability to maintain power under real-world loads.
- Qi2 Wireless Charging: We test wireless charging by attaching the pack to an iPhone and measuring how much charge it delivers in 30 minutes. We log both the percentage gained and the actual watt-hours transferred. This gives us a real-world speed benchmark for wireless use.
- Efficiency Testing: We compare the energy drawn from the battery pack to what’s actually delivered to the device (both wired and wireless). Efficiency matters: high losses mean wasted energy and more heat. Each pack gets a score for wired efficiency, Qi2 efficiency, and Qi2 thermal efficiency.
- Thermal Monitoring: We track temperatures during wired discharge, recharge, and Qi2 charging using sensors placed on the battery surface. This helps us identify thermal choke points or heat buildup that could limit performance or comfort in use. Products that stay cool under pressure earn extra points.
- Recharge Performance: We measure recharge speed (Wh per minute) and recharge efficiency (how much energy is needed to fully refill the pack). Fast recharging is great but not if it takes double the energy to do it. We test both metrics to determine how well-designed the recharge circuitry is.
- Magnetic Strength: Using calibrated force gauges, we measure the magnetic push and pull strength of each pack. This simulates real-world use: will the pack stay attached in your pocket or fall off if bumped? We also factor in how usable the pack feels when attached during charging.
- Size, Weight & Energy Density: We weigh each battery and measure its dimensions to calculate Wh per gram and Wh per cm³. A pack might perform well, but if it’s bulky and inefficient with space or weight, that knocks it down a few points. Portability still matters especially for wireless-first products.
Design
| Qi2 Battery Bank | Belkin Portable Charger 5k |
|---|---|
| Stated Capacity | 5,000 mAh (19.3 Wh) |
| Weight | 144.4 g |
| Thickness | 14.3 mm |
| Wireless Output | 15 W |
| Wired Output Max | 12 W |
| Ports | 1 × USB-C |
| Magnetic Strength (avg 18.9 N) | 17.7 N ❌ |
The compact footprint is the main selling point. At just 144.4g, it’s among the lightest packs in our Qi2 test group. The built-in metal kickstand is a handy feature, though it gets uncomfortably hot during use. A matte plastic shell and LED dot indicators keep things minimal, but the overall build feels more budget than premium.
Performance
| Qi2 Testing Results | Belkin Portable Charger 5k |
|---|---|
| Wireless Energy Delivered to iPhone in 30 mins (avg 2.9 Wh) | 2.21 Wh ❌ |
| Wireless Energy Drawn from Battery Bank in 30 mins | 4.61 Wh |
| Max Temperature (avg 53 °C / 127 °F) | 61 °C ❌ |
| Efficiency (avg 64%) | 48% ❌ |
Belkin’s tiny pack supports just one PDO at 12W and despite that low ceiling, it rarely hit it. During our real-world discharge tests, the bank would default to 5W shortly after hitting 50°C, dragging the full discharge time close to 5 hours. We only managed to pull 11Wh of usable energy out of a stated 19.3Wh making it have just 57% efficiency.
| Real World Capacity Testing | Belkin Portable Charger 5k |
|---|---|
| Stated Capacity | 19.3 Wh |
| Real World Capacity | 11 Wh |
| Energy Required for 100% Charge | 23.4 Wh |
| Recharge Time | 188 min (~3h 8m) |
| Real World Efficiency (avg 61%) | 57% ❌ |
Recharge performance was worse. Charging the bank took over 3 hours, consuming 23.4Wh in the process, putting recharge efficiency at just 47%.
Thermals
This pack runs hot. It peaked at 61°C during wireless charging making it hot enough that the metal kickstand became untouchable. Even during normal discharges, the bank hit 54.4°C, making it one of the hottest units tested.
Value
| Qi2 Battery Bank | Belkin Portable Charger 5k |
|---|---|
| Overall Score | — |
| Rank | — |
| Wireless Efficiency | 48% |
| Wired Efficiency | 57% |
| Price | $60 |
| Standout Feature | Ultra-slim size with built-in kickstand |
Despite the $60 price tag, this power bank delivers some of the weakest performance metrics in the group. With poor energy efficiency, high heat output, and throttled speeds, its only real upside is the slim form factor and that’s only compelling if you find it deeply discounted. Otherwise, there are better options, even among compact 5k packs.
Verdict
Belkin’s 5k Qi2 battery bank may look nice on your iPhone, but it struggles where it counts. With extreme heat issues, slow output, and unimpressive capacity recovery, we can’t recommend it. Unless the size is your absolute top priority and you find it on sale.
Looking for something that is worth all your penny in 2025? Check out this list!