I had the same "symptoms", as described here. The Plug/Unplug technique didn't seem to work, although hearing the clicking sound. After opening up the rear part of the battery to reveal the BMS, I could see the plug for balancing the cells (the plug with many wires attached) wasn't connected cleanly/flush. Looked like a production quality issue. After reconnecting my battery recharges fine. Just in case someone needs to hear this