Adafruit USB Li-Ion Power Bank with 2 x 5V Outputs @ 2.1A - 5000mAh

Unleash uninterrupted power with this compact, rechargeable battery pack, perfect for a 5V device like Raspberry Pi or Metro. Inside, a 5000mAh lithium-ion battery powers two USB A ports at 5VDC and up to 2.1 amps.Specifically designed to handle miniature computers and micro-controllers, it features high-performance boost converters to ensure consistent power delivery. Charge simultaneously while powering devices, with a built-in circuit drawing 2A from a 5V supply.For low-current loads under 100mA, keep your device awake and avoid the 'sleep mode' with a simple circuit. Please note, simultaneous charging and powering can cause an 80% efficiency loss, so plan usage accordingly.