(reserved for future updates)
What R124?
USB VBUS power control mod
Note, connect the R116 left side pad to a R10K. Verify with a multimeter that it is NOT connected to R117!
Note, connect R508 left side pad, or the power chip pin. Make sure it’s not connected to the right side pad which is 5V!
Note, if you’re trying this on mainboard 3.14-V5 (the new one that comes with uC), disconnect R512 instead of R508. See: The ClockworkPi V5 compared to the V4, corrected the power management power consumption issue - #35 by yatli
Battery life test, no USB VBUS mod
2022-12-2 01:42:51 100%
2022-12-2 08:26:54 90%
2022-12-2 11:06:02 89%
2022-12-2 12:25:01 87%
2022-12-2 13:35:47 86%
2022-12-2 15:50:46 79%
2022-12-2 18:35:15 70%
2022-12-2 21:47:34 62%
2022-12-2 22:54:00 57%
2022-12-2 23:53:51 53%
2022-12-3 00:47:18 50%
2022-12-3 01:47:36 45%
2022-12-3 03:04:20 39%
2022-12-3 13:25:29 5%
2022-12-3 13:42:54 4%
2022-12-3 14:46:05 3%
2022-12-3 15:24:10 3%
Very likely it will do >2days…
Edit: uh oh the fuel gauge not very linear.
We may need to add support for axp228 battery capacity calibration.
Current projection:
Battery life test, with USB VBUS mod (kbd off in suspend):
| TIME | BATT |
|---|---|
| 1/30/23 9:26 PM | 100 |
| 1/31/23 2:51 AM | 100 |
| 1/31/23 5:33 AM | 100 |
| 1/31/23 8:00 AM | 100 |
| 1/31/23 4:33 PM | 93 |
| 1/31/23 8:53 PM | 89 |
| 2/1/23 4:15 AM | 83 |
| 2/1/23 8:18 AM | 79 |
| 2/1/23 8:55 PM | 69 |
| 2/2/23 12:23 AM | 66 |
| 2/2/23 8:07 AM | 59 |
| 2/2/23 11:16 AM | 56 |
| 2/2/23 9:44 PM | 47 |
| 2/2/23 11:07 PM | 45 |
| 2/3/23 3:23 AM | 41 |
| 2/3/23 6:58 PM | 2 |
So, it lasted from 1/30/23 9:26 PM to 2/3/23 6:58 PM, shy of FOUR DAYS.
The USB VBUS mod almost doubled the standby time.