Hi, supposedly you can pair the JBL boxes with each other. But I haven't tried it myself yet. If necessary, simply download the JBL app to your mobile. I did it for my Partybox 110, for example. Pairing is super easy here.
I listened to both speakers in the shop. The Charge 5 sounds really squawky next to the Flip 6. If you just want to listen to music quietly on the side, I think the Charge 5 is enough.
According to my information, there is only one JBL Charge 5. It has a built-in rechargeable battery, if you want to call it that. However, you can also charge your smartphone on the speaker if necessary, it's a power pack at the same time. But then the battery won't last 20 hours... Greetings Paul
As far as I know, this is not technically possible, there are only two different sources for Bluetooth connections.
However, with JBL you can connect an infinite number of Bluetooth boxes together, according to the master/sllave principle, which is how I solved it.
JBL Charge 5: 40 Watt, 20mm dome tweeter, 60 HZ - 20'000 HZ frequency response, IP67 waterproof and dustproof. I hope I have served you well. Greetings