Best battery pack for iPad Mini 4 ?

[max2]

You know those portable battery packs but its ok if it is not really portable because it is staying at home if the lights go out.

Which one do you find the best ?

 

[garyleecn]

really depends on your needs.

whether you just need it to power an extra like 3-5 hours,
or you need it to give you an extra day's work,
or even larger, couple days for camping.