Peak Shift not respecting minimum battery threshold

Question

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
================================================================================

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

DELL-Daniel V · Accepted Answer

@advtal52​ That is correct, custom schedule + minimum threshold is no longer available in our Windows tools (for now). If it were up to me, I'd have both the peak shift features and the dynamic AI features available. That way those who wanted more granular control can have it. It's removal likely came down to a lack of use with the majority of the user base. Power users are certainly going to tinker with the options available to them, but your average Joe just wants the thing to work. If Optimizer is automatically helping them increase battery life without user input, then its what the masses will follow (they might not even know about it too).  However, this does not account for adjustments within the BIOS. Take our newer Dell Pro Max 14 MC14250 for example. The functionality you're looking for is indeed present in the Power settings here.  It just requires a user to go into the BIOS and configure that instead of with a tool like Optimizer.

DELL-Daniel V · Answer

Please note that Dell Power Manager is end of life and has been replaced by Dell Optimizer. If you would prefer to continue with Power Manager, then I'd recommend uninstalling it and reinstalling it to see if there is any change. Should that still not have an impact, then I would uninstall it once more and install Optimizer. You'll then want to test the battery changes in that app. I'd also ensure that the BIOS Power Management settings are not interfering (ctrl+f and search power).

advtal52 · Answer

Hi, thanks for the response.

I followed your steps — uninstalled Power Manager, installed Dell Optimizer as suggested.

However, Dell Optimizer does not include a Peak Shift feature. The battery configuration options available are limited and don't offer the ability to schedule AC/battery usage by time window with a minimum threshold, which is the core functionality I was using.

Is Peak Shift being replaced by an equivalent feature in Optimizer that I'm missing, or has that functionality been discontinued entirely?

DELL-Daniel V · Answer

@advtal52​ Unfortunately, the peak shift features are unlikely to return. Optimizer instead uses AI and machine learning models to apply appropriate charge policies based on use. You'll really just have the Dynamic Charge Policy and the Intelligent Battery Extender options. You can refer to this user guide for additional details on what they do. Could try reinstalling Power Manager to see if that then picks up the peak shift features correctly. Or you can try to adjust the peak shift settings in the BIOS itself so that it can work in conjunction with Optimizer.

advtal52 · Answer

@DELL-Daniel V​  Thanks for the clarification — that's very helpful to know. Just to make sure I understood correctly: Peak Shift as a manual, user-configured feature (custom schedule + minimum threshold) is no longer available going forward, and Dell Optimizer handles battery policy automatically through AI instead. There's no equivalent manual control in the new toolset. I'll go ahead and work with Optimizer's Dynamic Charge Policy and Intelligent Battery Extender, and explore the BIOS settings as you suggested. Appreciate the honest answer.

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Peak Shift not respecting minimum battery threshold

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