Using Powebank for Dell Venue 11 Pro (5 volts, 1 Ampere)

hi,

is there any Problem/ could damage the device, if i use my powerbank to charge my Venue 11 pro 5130 with the output spec:

5 Volt

1 Ampere

While my long trip if my battery is low? i know i should use original charger but please just say the fact what happens if i use powerbank with such specifications.

thank you..