SOURCE: Hello, I have charged the
Perhaps the battery has moved (due to a shock of the device) and is not connected (as it should be in the device).
Open the device and check that the battery is connected properly.
Then try to recharge.
Also, it's a good idea to remove the battery and test (with a voltometer) that it has some voltage.
Finally, if the battery was used for a long time or charged too often (without the battery being fully decharged), you might have to replace it.
If I were you, I would replace it with a stronger battery. according to specs, WWS500 have a 700mA battery, I would put a 100mA battery instead.
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