This piece covers how to charge the Sony XB30. Do this easily through the micro USB power in port, shown in the pictures below. Note that you can still play your XB30 as it recharges, without raising the charging time by very much.
To start with, pick a powerful enough USB adapter.
Next, connect a medium to high current USB cable between the speaker and that adapter. Note that the speaker comes with a an adapter.
Then, plug the charger into a working wall outlet.
And finally, after four hours or so, the XB30 finishes recharging. So it’s ready to play once more for up to twelve (12) hours before needing another charge-up.
How to Charge Sony XB30, Step by Step
1. Choose Correct Size AC or Car Adapter
Firstly, the charger you use should provide 5 volts at 3 amps (15 watts) for fastest results.
2. Power OFF the Unit to Continue with How to Charge the Sony XB30
Note that the SRSXB30 still charges when running. But the speaker might charge a trifle faster when turned OFF. How much slower it charges depends on how much above-and-beyond recharging headroom your charger offers.
3. Plug the Power Cord into the Speaker
Then, open the water resistant port door.

This exposes the barrel type DC input input port as we see next.

Then, plug the small end of the cable into the port on the back of the speaker.

4. Plug the Adapter into a Working Wall Receptacle to Continue with How to Charge Sony XB30
Next, connect the mains end of the adapter to a working AC outlet. So here, we plug ours to a power strip surge protector.

The status lamp lights up solid orange on the speaker. But there is no battery status gauge that shows percentage of charge. Yet the glowing CHARGE lamp does tell that charging is occurring.

5. Let the XB30 Charge Until the Orange CHARGE Light Goes Out
Finally, full battery charging is complete when the solid glowing CHARGE lamp on the top panel. It’s behind the Power button, and it turns off, as shown next.

6. Unplug the Cable from the XB30
Also, close the port cap to maintain water resistance.

7. Done with How to Charge Sony XB30 !
At last, we have now fully charged this Sony speaker.
Finally, repeat this recharging every twenty-four (24) hours of play. Or recharge any time the 30 goes dead. Doing so keeps the battery in top condition for years to come.