# Which battery pack offers the best capacity for my needs? — Verified Specification Comparison

> All specification data verified from official manufacturer documentation.

Which battery pack offers the best capacity for my needs?

## Products

### Rolling Square Rolling Square TAU 2 Portable Power Bank
```yaml
product: rolling-square-rolling-square-tau-2-portable-power-bank
brand: Rolling Square
price_gbp: 29.73
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
size: 56 x 43 x 19 mm
weight: 50 g
capacity: 2000 mAh
output_current: 1 A
number_of_ports: 3 (USB-C, Lightning, Micro USB)
input_charging_method: magnetic dock and USB-C
```

- **Price:** £29.73 [^1]
- **Summary:** The TAU 2 is a 2,000 mAh keyring power bank with integrated USB-C and a combined Lightning/Micro-USB connector, an NFC tag, and a magnetic dock for automatic charging. It's ultra-compact and lightweight (50 g), designed as an emergency 'always-ready' boost for phones and small devices.
- **Ideal For:** Ideal for users who need a lightweight emergency boost-its 2000 mAh capacity and integrated connectors provide a quick ~30% phone top-up while staying attached to your keys.
- **Additional Sources:** [^1]

### Anker Anker 165W Laptop Battery Pack (25,000mAh)
```yaml
product: anker-anker-165w-laptop-battery-pack-25-000mah
brand: Anker
price_gbp: 89.41
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
size: 156.97 x 53.85 x 49.02 mm
weight: 595 g
capacity: 25,000mAh
number_of_ports: USB-C (3), USB-A (1), two built-in USB-C cables
input_charging_method: USB-C
```

- **Price:** £89.41 [^2]
- **Summary:** High-capacity 25,000mAh power bank with up to 165W combined output, three USB-C ports, a USB-A port and two built-in retractable USB-C cables. It includes an LCD-like display for real-time charging info and ActiveShield thermal protection, making it suited for charging laptops and multiple devices simultaneously.
- **Ideal For:** Ideal for users needing maximum portable capacity and laptop charging-25,000mAh capacity and up to 165W combined output allow sustained laptop and multi-device charging.

### Anker Anker Prime 65W Battery Pack (9,600mAh)
```yaml
product: anker-anker-prime-65w-battery-pack-9-600mah
brand: Anker
price_gbp: 67.06
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
size: 1.71 × 1.65 × 4.53 in
weight: 10.76 oz
capacity: 9,600mAh
charging_time: 2 to 2.5 hours
output_current: 3A / 3A / 3A / 3A / 3.25A
output_voltage: 5V / 9V / 12V / 15V / 20V
number_of_ports: 2 (USB-C)
input_charging_method: Fold-out AC plug and USB-C input (100V-240V AC, 2.0A; USB-C PD)
```

- **Price:** £67.06 [^3]
- **Summary:** Compact 9,600mAh power bank that doubles as a 65W wall charger with fold-out AC pins, a 1.3-inch LCD, and two USB-C ports supporting high-speed PD charging. It delivers up to 65W single-port output or 45W+20W when both ports are used, making it suitable for phones, tablets, and some laptops. Fast recharge (~2-2.5 hours) and pocketable dimensions prioritize portability and versatility.
- **Ideal For:** Ideal for users needing a portable charger with high single-port power (65W) and 9,600mAh capacity for charging laptops and phones quickly.
- **Additional Sources:** [^4], [^5]

### GOODaaa GOODaaa Power Bank Wireless Charger 36000mAh
```yaml
product: goodaaa-goodaaa-power-bank-wireless-charger-36000mah
brand: GOODaaa
price_gbp: 32.03
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
size: 6.6 in x 3.5 in x 1.1 in
weight: 15.2 oz
capacity: 36000 mAh
output_current: 3A
output_voltage: 5V
number_of_ports: USB A (1), USB C (1), Lightning (1) built-in cables, Micro-USB (1) built-in cable, wireless (1)
input_charging_method: USB-C, Micro-USB, Solar, USB-A input cable
```

- **Price:** £32.03 [^6]
- **Summary:** Large 36000 mAh solar-capable power bank with 15W wireless charging, built-in output cables (USB-C, Lightning, Micro-USB), multiple ports and dual LED flashlights for outdoor use. Durable, weather-resistant design and carabiner make it suited for long trips, emergencies, and charging multiple devices simultaneously. Supports charging six devices at once (wired + wireless).
- **Ideal For:** Best for users needing maximum capacity-36000 mAh and multi-device outputs let you charge many phones multiple times without access to mains power.
- **Additional Sources:** [^7]

### INIU INIU P512 20000mAh
```yaml
product: iniu-iniu-p512-20000mah
brand: INIU
price_gbp: 23.36
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
size: 2.8 x 4.1 x 1.2 in
weight: 11.1 oz
capacity: 20000 mAh
charging_time: ~5 hrs 52 mins
output_voltage: 22.5W (max)
number_of_ports: USB-C x2, USB-A x1
input_charging_method: USB-C (IN/OUT, 20W recharge)
```

- **Price:** £23.36 [^8]
- **Summary:** Compact 20,000 mAh power bank with 22.5W fast charging, built-in USB-C GoCord, digital LED percentage display, flashlight, and three output ports; suitable for charging phones, tablets, and multiple devices simultaneously. It's TSA-compliant and designed for travel and outdoor use. 
- **Ideal For:** Best for someone needing high capacity in a compact, travel-friendly pack because it provides 20000 mAh and 22.5W fast output with two USB-C ports and one USB-A port.
- **Additional Sources:** [^9]

---
## References & Sources
[^1]: Rolling Square, accessed 2026-06-16. https://rollingsquare.com/products/tau-2-a-new-kind-of-power-bank
[^2]: Best Buy, accessed 2026-06-16. https://www.bestbuy.com/product/anker-laptop-power-bank-25k-165w-built-in-and-retractable-cables-black/JJ858RXPXJ
[^3]: Anker (official store), accessed 2026-06-16. https://www.anker.com/products/a1339-anker-prime-power-bank-9600mah-65w-fusion
[^4]: Best Buy, accessed 2026-06-16. https://www.bestbuy.com/product/anker-prime-power-bank-9-6k-65w-fusion-black/JJ858RY4S6
[^5]: Target, accessed 2026-06-16. https://www.target.com/p/anker-9600mah-65w-prime-power-bank-fusion-black/-/A-94430360
[^6]: BLAVOR store, accessed 2026-06-16. https://blavorpowerbank.com/products/w22
[^7]: Walmart, accessed 2026-06-16. https://www.walmart.com/ip/36000mAh-Solar-Charger-Power-Bank-15W-Fast-Charging-4-Cables-Wireless-Charging-USB-Battery-Pack-Solar-Phone-Charger-Compatible-iPhone-Android/471765021
[^8]: Best Buy, accessed 2026-06-16. https://www.bestbuy.com/product/iniu-portable-charger-compact-20000mah-pd-power-bank-with-built-in-cable-digital-display-for-iphone-samsung-etc-black/CZW8VCWV9R
[^9]: CleverHiker (links to retailers), accessed 2026-06-16. https://www.cleverhiker.com/backpacking/iniu-20000-pd-power-bank-review/