Amp for a Beatboxer and outside

[Skarok]

Hi guys,

I am using a BOSS RC-505 Loop-Station a Mic and soon a DigiTech BP 355 for beatboxing. Last thing I need to kick some beats outside in the sun is an amp that runs on batteries. Can you recommend one? What kind of amp is good for that purpose?

I would very much appreciate some help on this topic.

Greetings!