Peak Shift not respecting minimum battery threshold
Hey everyone, posting this in case someone else has run into the same issue and also to escalate it to Dell.
I have a Precision 5560 that I use primarily plugged in (USB-C charger or dock). I had Peak Shift enabled to keep the battery cycling and avoid leaving it permanently at 100%, which I know isn't great for long-term health.
The problem is that the 35% minimum threshold simply doesn't work. Instead of resuming charging when the battery hits 35%, the system just keeps draining — I watched it drop all the way down to 4% while the charger was physically connected. The only way to get it charging again was to manually disable Peak Shift.
The charger itself is fine — as soon as I turned Peak Shift off, charging resumed immediately. SupportAssist keeps everything updated so BIOS and drivers are current.
Has anyone seen this on their Precision? Is there a known fix?
Full details below.

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ISSUE DETAILS
Peak Shift: Charge threshold not triggering correctly
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SYSTEM INFORMATION
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Model:              Dell Precision 5560
BIOS:               Dell Inc. 1.44.1, 2/12/2025
Operating System:   Windows 11
Management:         SupportAssist 5.0.1.2516 (system fully updated)
Primary use:        Connected to AC power
Connection type:    USB-C (original Dell charger / Dell dock WD19 180W FW 01.01.01.01)
Dell Power Manager: v3.17.0




PROBLEM DESCRIPTION
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The Peak Shift feature in Dell Power Manager does not respect the configured
minimum charge threshold (35%).

Active configuration:
  - Peak Shift: ENABLED
  - Schedule: 08:00 to 10:00, every day
  - Minimum threshold configured: 35%

EXPECTED BEHAVIOR:
  1. At 08:00, the system activates Peak Shift.
  2. The system stops charging and begins running on battery.
  3. Upon reaching 35%, the system resumes charging from AC.
  4. The battery stays above the threshold until 10:00.

ACTUAL BEHAVIOR (ISSUE):
  1. At 08:00, the system activates Peak Shift.
  2. The system stops charging and begins running on battery.
  3. Upon reaching 35%, the system does NOT resume charging from AC.
  4. The battery continues to drain with no stopping point.
  5. Battery was observed dropping to 4% while physically connected to charger.
  6. The system was at risk of abrupt shutdown.
  7. Upon manually disabling Peak Shift, charging resumed immediately —
     confirming the charger was functioning correctly.


CONDITIONS
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  - Occurs with original Dell USB-C charger connected directly.
  - Occurs with USB-C Dell dock WD19 180W FW 01.01.01.01.
  - OS and BIOS fully updated via SupportAssist.


TEMPORARY WORKAROUND APPLIED
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Peak Shift was disabled and battery mode was set to "Primarily AC Use".
This prevents shutdown risk but removes the originally desired functionality.