Answer to: Replacment Battery for the Marshall Kilburn Bluetooth SpeakerLooks like my previous comment was marked as spam. Trying again... A couple notes: 1) Batteries are wired in serial, with 2 extra leads to the negative terminals of the middle batteries, I think for individual cell monitoring/balancing. I've found 14.8v, 4s1p PCBs online with a diagram of the same wiring. 2) The 2 red leads to the connector are wired to a single solder joint on the PCB, as are the 2 black leads. Same as you found inside the speaker. Let me know if you need any other shots of the PCB.