You can recharge the JBL Charge 4 portable speakers through their hidden USB charging connections. To summarize how to charge the JBL Charge 4 : First, choose a right sized USB power adapter.
So connect the included Black USB-C cable between the Charge 4 and your power adapter. Then plug the adapter into a working wall outlet. Finally after four to five hours, your speaker will fully charge. At last it will play again for up to twenty hours roughly, before another recharge.
How to Charge JBL Charge 4: Step by Step
1. Choose Right Size Charger
Firstly, the power supply should be able deliver 15 watts (5 volts at 3 amps). This gives the quickest charging times.
Also, to avoid having to get a different cord, pick a charger with a female USB-A output port. This way the cable that comes with this speaker will fit it.
For this demo however, we use the adapter that came with our Charge 3. However, though it doesn’t output quite the max current, the Charge 4 still charges in about the same time.
2. Open the Port Cover on the Back
Then pry open the waterproof seal port cover on the speaker rear. This reveals the USB-C charging port inside. It’s the port on the left.
3. Plug in the USB-C Cord to Continue with How to Charge JBL Charge 4
Insert the small end of the black USB-C charging cable into the matching port in the speaker, as shown next.
4. Plug the Other End of the Cord into the Power Adapter
Then, connect the A end of the USB charge cable to your power supply of choice.
5. Plug that Wall Adapter into a Working Outlet
Connect the charger to a working AC outlet. Here, we’re charging from a surge protecting power strip.
At least one of the battery status lamps lights up when you connect power. Furthermore, there are five lamps that light one after the other, to show charging progress.
6. Allow the Speaker to Charge Until All Battery Indicator Lamps Go Out
Recharging is almost complete when all but the last of the battery gauge lights glow solid. The last one continues flashing though, for a few minutes more while the system tops off the charging.
After that, the battery recharge cycle finishes when all battery status gauge lights go out.
7. Unplug the USB-C Charge Cable
8. Fully Close the Waterproof Port Door
Note that unless you close this flap completely, water may enter the port area. Furthermore, this could damage the electronics inside. So, be attentive, and press the port door closed firmly. To that end, use enough pressure to fully seat it, to get full water resistance.
9. Done with How to Charge JBL Charge 4 !
Finally, we have now fully charged our speaker. To further confirm this, check out the battery indicator just after turning on the speaker afterwards. Note that all lamps glow, meaning that the speaker has a full charge.
So repeat this recharging every twenty hours of music play, to keep its battery in top working order. We charge ours when the battery indicator shows only one light glowing.