Repair the XDOBO X8 Bluetooth speaker that won't power on

Repair the XDOBO X8 Bluetooth speaker that won't power on
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[@metalhead6455]

I'm trying to replace the battery of my xdobo x8ii. What battery voltage i use 3.7v or 7.4v?

[@serdnanadlor0l]

Great repair skills

[@repairandrework]

Thankyou