UGREEN PB537 Batería externa 20000 mAh 55W gris

On a cross-country train, a developer keeps a laptop and phone alive through a full workday using the UGREEN PB537. Its 20000 mAh capacity and 55W total output handle multiple devices without hunting for outlets.

Key specifications

• Battery capacity: 20000 mAh / 74 Wh
• Max total output: 55W
• Ports: 2x USB-C (45W and 30W PD), 1x USB-A (18W QC)
• Input: USB-C 45W PD, recharges in ~2 hours
• Fast charging protocols: PD3.0, QC3.0, FCP, AFC, SCP, BC1.2
• Safety: Over-charge, over-discharge, over-current, over-voltage, short-circuit, temperature protection
• Material: Fireproof PC + ABS
• Display: LED indicator
• Colour: Grey

Why choose it

Charge a laptop, tablet, and phone simultaneously. The 45W USB-C port powers most ultrabooks at full speed, while the 30W port handles smaller devices. A 45W PD input refills the pack in about two hours, so you're not tethered to a wall overnight.

Ideal use cases

• Business travel: keep laptop and phone charged during long flights or layovers
• Remote work: power devices in cafés, parks, or co-working spaces without outlets
• Daily commute: top up multiple gadgets on the go
• Outdoor activities: reliable backup for cameras, drones, and GPS units

Good to know

The LED indicator shows remaining capacity at a glance. Fireproof PC + ABS housing and comprehensive circuit protection ensure safe operation. Compact enough for a backpack pocket, yet powerful enough to replace a wall charger for a day.