How do I charge my JBL flip3 speaker

It sounds like the internal battery has failed. Try and claim on the warranty or ask for a repair.

JBL Support - Returns & Warranty

JBL https://ca.jbl.com > support-returns-and-warranty
If you believe your product is malfunctioning during the warranty period, we can help!

Warranty

JBL https://ca.jbl.com > warranty
Unless a different warranty period is stated in the Warranty Card provided with your JBL product, JBL warrants for a period of 1 year (5 years for any non- ...

Troubleshooting help

https://www.ifixit.com/Wiki/JBL_Charge_4_Troubleshooting

JBL Charge 4 TroubleshootingiFixithttps://www.ifixit.com > Wiki > JBL_Charge_4_Troub...Make sure the charging light on the base of the device is blinking. If it is fully charged and still not turning on, the power button may be worn out or broken. ‎The Speaker Will Not Power... · ‎The Device Won't Connect to.....

Try doing default factory settings.
Step 1. Press the "Power" button located on the top center part of your JBL Charge 4 Bluetooth speaker. The speaker will be powered on when the LED backlight under the Power button is lit.
Step 2. Hold down the "Bluetooth" and "Volume Up" buttons at the same time for roughly three seconds. The Volume Up button looks like a plus sign. Additionally, it's important to hold down the "Bluetooth" button in the center of the device next to the Power button, as it's easier to hold down. After three seconds, the LED ring around the Power and Bluetooth buttons will briefly light up before the JBL Charge 4 powers down.
Step 3. Press the "Power" button again to turn the JBL Charge 4 Bluetooth speaker back on. The Charge 4 will instantly turn on in Discovery mode, with the Bluetooth LED blinking on and off, and the speaker making a pinging sound. This confirms that you've successfully reset your JBL Charge 4 to its default factory settings. You'll need to pair or re-pair any devices you want to play audio through the JBL Charge 4 speakers with the device.

what operating system is laptop ?
is it windows vista ?
https://support.microsoft.com/en-us/help/933144/the-audio-output-is-not-automatically-routed-to-a-bluetooth-audio-devi

Pull it out and see if it needs to be re conned or something is hitting the magnet drawing the power out of it

If you are positive that the charger is good, then the batteries have died a noble death and need replacement.



They are only good for so many recharge cycles before going to battery heaven.

This indicates that the Blue tooth pairing with the already paired device has been reset and the JBL Flip is ready for pairing with new device. This position, red and blue blinking, can be obtained by long pressing the power buton.

might have roasted your speakers voice coils a little which may be sending the amp into protect mode throw a speaker on it that you know works and if it doesnt trigger the protect circuit then you probably have a blown or almost sub.

check you speakers and power source make sure all connection is correct

Turn off the JBL at the mains, turn it back on then turn on the JBL, the remote should work it did for me.