Ansmann AA 2850 mah High Capacity Slimline Rechargeable Battery 4-pk Style:4-Pack it is possible to use

it is possible to use a connected Li-Ion battery pack as an emergency power source for USB devices

Use this battery anywhere you would use a 9V alkaline battery

to ANSI FL1)

AT A GLANCE: 2 LEDs indicate power connection and charging process

Ansmann AA 2850 mah High Capacity Slimline Rechargeable Battery 4-pk Style:4-Pack it is possible to useStrongest and longest rechargeable batteries on the planet. Great for wireless mics, digital cameras and more. For dimension sensitive device including Shure wireless Engineered for long run time and high recycles. Why use alkaline batteries when you can get up to 1000 recycles with this high capacity rechargeable battery? Cost a little more than consumer grade, but yields up to 1000 recycles instead of a 100