Macbook A1466 with an 820-00165 board has arrived with "Will not charge battery" as the fault. It has been through several hands and the battery in the machine is not original. Frustratingly the wifi coax lead has been crushed under the heatsink retainer lug & screw ( MORONS!!! ) which leads me to have a bit of a cursing moment to the audience. Ultimately we find that one of the I2C lines used for communication between the battery, ISL and SMC has a short on it.