Some current load measurements would be useful. Both for LED load current and Pico sleep current.
For LiFePO4, IIRC only A123 cells (nanoparticle tech) can handle really high discharge loads well. I have both AA and AAA LiFePO4 cells, and the AAA cells are pretty weak if the current draw is high, but 4-10 year old cells still cycle well so I can't complain. For OP's 2000mAh battery, I'd assume a 18650 cell.
From the charts, I suspect the current draw of the NeoPixels is high. By the second day, the cell voltage is under 3.1V, so capacity is already quite a bit under 25% -- not really enough battery capacity to run those LEDs reliably, day after day. Looking at AdaFruit's site, each SK6812 (for example) has a current draw of about 50 mA at 5V. If the battery voltage is boosted to 5V for the LEDs then the load current at the battery terminals would be higher. A high C load and effective battery capacity may suffer. So it would be useful to check the current draw of the LED gizmo.
For LiFePO4, IIRC only A123 cells (nanoparticle tech) can handle really high discharge loads well. I have both AA and AAA LiFePO4 cells, and the AAA cells are pretty weak if the current draw is high, but 4-10 year old cells still cycle well so I can't complain. For OP's 2000mAh battery, I'd assume a 18650 cell.
From the charts, I suspect the current draw of the NeoPixels is high. By the second day, the cell voltage is under 3.1V, so capacity is already quite a bit under 25% -- not really enough battery capacity to run those LEDs reliably, day after day. Looking at AdaFruit's site, each SK6812 (for example) has a current draw of about 50 mA at 5V. If the battery voltage is boosted to 5V for the LEDs then the load current at the battery terminals would be higher. A high C load and effective battery capacity may suffer. So it would be useful to check the current draw of the LED gizmo.
Statistics: Posted by katak255 — Fri Sep 06, 2024 7:15 pm