Hello everyone,
I have a problem with the battery playtime of my '''Harman Kardon Onyx studio 4'''.
On '''max volume''' it lasts '''barely 1h30min''' whereas '''it used to last at least 3h''' (it should last a theoretical 8h of playtime on normal volume).
Thinking that the battery life had ended, I replaced it with a new one and charged it as recommended but the problem persisted.
I replaced the battery with another new one thinking that the other may be defective but the problem is the same.
When plugged to a wall outlet, the speaker works for as many hours as needed, it charges as well, so I don't think there's a problem in the power input. The battery lasts for more than 3 hours on normal volume.
I have another same speaker but newer and the battery lasts for more than 3h on max volume.
What could be the problem? Could it be the charging circuit ?
Many thanks!