The failure,
battery: (dis)charge rate invalid

is due to kernel complain about the firmware report the negative Present
Rate on the _BST method

the comment on kernel driver/acpi/battery.c,
 /* For buggy DSDTs that report negative 16-bit values for either
  * charging or discharging current and/or report 0 as 65536
  * due to bad math.
  */

kernel has workarounded it with using the ABS() positive value.
                battery->rate_now = abs((s16)battery->rate_now);


** Changed in: linux-lts-raring (Ubuntu)
       Status: Triaged => Won't Fix

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https://bugs.launchpad.net/bugs/1250354

Title:
  [Dell Inspiron 5737] fwts reported high failure about klog[Firmware
  Bug]: battery: (dis)charge rate invalid.

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