Selon la revue: https://www.lite-magazin.de/2016...
Est dit ""If you own a JBL Charge or another model in addition to the Boost TV, they can be wirelessly paired with each other via the "JBL Connect" function.""

Boost TV peux être connect grâce a l'app *JBL Connect* avec un JBL Charge, ou autre JBL modèle. Mais pas testé personnellement.

Official response from JBL:
No it is not possible, because the Charge 2+ speaker does not have 'JBL Connect' technology.
"With the Flip3, Charge 3 model speakers you can do it.

This is what the leaflet says.

JBL Connect allows wireless daisy-chaining of multiple speakers. JBL Connect requires an additional compatible speaker such as a JBL Flip 3, JBL Xtreme or JBL Pulse 2. For more information, please visit our website
1. Confirm that you have paired at least one Bluetooth device to the JBL Boost TV.
2. Press the JBL Connect button on the remote control or top panel of the JBL Boost TV.
panel of the JBL Boost TV.
3. Press the JBL Connect button on your other JBL speaker.
4. Play music from your wireless device. You will hear sound on both speakers.
both speakers.
5. The volume is synchronised between the two devices, so increasing or decreasing the volume on one device also affects the other.
volume on one device also affects the other.
6. To turn off JBL Connect, turn off the second device.

So logically if the jbl charge 3 is in the list (see jbl website), it should work. However, I have not tested this feature.

Sorry, no idea.