Solved Does My Battery Need To Be Replaced Or Is Something Else Going On Teenage Engineering Op 1

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My OP-1 hasn’t kept a charge in over year. However, up until last week it’s always worked when I plugged it in. Now it won’t turn on at all. Is this a battery issue or something else?

Also, while I was previously able to use it when plugged in, it would often give off a constant high pitched hum until I unplugged it and plugged it back in…

Turned out it was the connector port. Easy solution. Battery was fine.