Selectec 5000mAh External Battery Charger Pack Power Bank for Nokia Lumia 920 640 XL 640 LTE 830 635 1520 530 1320 435 630 Icon 2520 1020 925 928 521 520 822 810 820 Capacity: 5000 mAh Input Current: DC5V 1A / Output Current: DC5V 1A Battery Type: Li-polymer Ultra-Slim design, Lightweight and durable construction. Built in protection against shorts and overcharge/discharge.