I suppose there might be a few reasons for this anomaly.
# both batteries may be bad even though one is new such that they draw to much current and reduce the voltage available for the computer.
# There is a problem with the internal charge circuitry.
You could get another battery or find another identical computer to try the batteries in.
Otherwise, I don’t know of any other troubleshooting procedure for this.
If you could get it to boot, you could run '''powercfg /batteryreport''' in a cmd or powershell window.