The new additions to JBL's portable party speaker "PartyBox" series are the "JBL PartyBox 520" and "JBL PartyBox Encore Essential 2".
The "JBL PartyBox 520" delivers 400W of powerful sound with a battery that can play continuously for up to 15 hours. It is also splash-proof and IPX4 compliant, so that you can use it outdoors without worry.
The "JBL PartyBox Encore Essential 2" not only has the powerful JBL pro sound of the higher-end model, but also allows for up to 15 hours of continuous playback. It can be used outdoors or at party venues, and can also be used as a simple car audio system by placing it on the car seat while driving. Please take this opportunity to consider it!

JBL / JBL PartyBox 520
JBL / JBL PartyBox Encore Essential 2