📘 Rocknix Battery Calibration Guide (Anbernic RG353V)

✅ Objective

Perform a complete and controlled calibration of the internal battery on the Anbernic RG353V running Rocknix OS.

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🚀 Step-by-Step Guide (Beginner-Friendly)

1. Preparation

• Fully charge the console if not already done.
• Ensure SSH access is available.
• Optionally, use a USB tester to monitor charging current.

2. Set High-Performance Mode (During Drain)

Change these settings via GUI:

• Start screensaver after: 0 min (disabled)
• Scaling governor: performance
• GPU performance profile: best performance
• Power saving mode: disabled
• Display brightness: 100% (⚠️ Increases LCD wear, but ensures a fast and clean full-power drain)

🛈 Note: Even when the screen is blacked out by the screensaver, the LCD backlight stays on. Use full brightness to force higher drain speed.

3. Start Active Drain

Via SSH:

for i in $(seq 1 4); do while :; do :; done & done

4. Monitor Battery in Real-Time

watch -n 60 'echo -n "⏱  "; date "+%H:%M:%S"; echo -n "🔋  "; cat /sys/class/power_supply/battery/{capacity,status}; echo -n "⚡  charge_now: "; cat /sys/class/power_supply/battery/charge_now; echo "-------------------------------"'

Wait until the console powers off on its own (0% battery).

5. Cooldown (~15 min)

Let the console cool down before reconnecting to power.

6. Start Charging

Plug the device into power and boot Rocknix. Immediately apply these settings:

• Display brightness: 5% (black screen still keeps backlight active — lowers wear during charge)

• Restore all other settings to default or:

  • Start screensaver after: 1 min
  • Scaling governor: ondemand
  • GPU performance profile: balanced
  • Power saving mode: default

Monitor battery status as above until:

• capacity = 100%
• charge_now ≈ 3,151,000

Then leave the console plugged in for 30 additional minutes (trickle phase).

7. Done!

Unplug the device. Battery is now calibrated and reporting correctly.

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📆 Key Timestamps (Example Session)

Phase	Time	Details
Drain start	08:52	CPU 100% loop started via SSH
50% discharged	10:17:27	charge_now: 1,571,908
23% discharged	11:04:31	charge_now: 724,808
10% discharged	11:27:03	charge_now: 308,224
0% / Shutdown	11:45:35	charge_now: 0
Charging start	~13:30	Boot from 0%
50% charged	15:01:39	charge_now: 1,573,284
100% charged	16:44:41	charge_now: 3,150,868
Trickle end	17:15:42	charge_now: 3,150,696

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🧠 Technical Appendix (Power Users)

Commands

Drain CPU fully:

for i in $(seq 1 4); do while :; do :; done & done

Monitor battery:

watch -n 60 'echo -n "⏱  "; date "+%H:%M:%S"; echo -n "🔋  "; cat /sys/class/power_supply/battery/{capacity,status}; echo -n "⚡  charge_now: "; cat /sys/class/power_supply/battery/charge_now; echo "-------------------------------"'

Check CPU load:

htop

Post-charge current (USB tester reference)

• Active charge: ~1.2A
• Pre-trickle: ~0.3A
• Trickle phase: <0.1A, slowly dropping

System Notes

• charge_full_design: 3,151,000 µAh
• Calibration successful with <0.01% deviation
• yes command not available on Rocknix base system
• Commands executed via SSH as root
• No sleep/suspend active during process
• Final cable removal done manually

Common Notes & Observations

• 💡 LCD stays backlit even during blank screensaver — only the content is blacked out.

• 🔍 After reaching 100%, battery status may toggle to Discharging. This is expected: the PMIC disables active charge once full.

• 📐 You can manually calculate % with:

  ( charge_now / charge_full_design ) * 100

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🧩 System Info

• Device: Anbernic RG353V
• OS: Rocknix build 20250517 (Official)
• Tools used: SSH, USB tester (optional)

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🔚 Outcome

Battery is fully calibrated. Charge level reporting is now accurate and matched to the hardware spec.

You can share this guide as a GitHub repo or Gist — it may help other Rocknix/Anbernic users.