RE: SoC values after battery profiling

robsrick — Tue, 19 Nov 2024 13:42:08 GMT

rhanks i'll give it a try

RE: SoC values after battery profiling

ketiljo — Tue, 19 Nov 2024 13:16:01 GMT

If the battery is charged using the standard charging currents and the correct voltage and current termination levels specified in the battery datasheet, fuel gauge re-initialization will clear any errors in the state of charge (SOC) prediction. The re-initialization process (fuel_gauge_init) is based on the initial set of measurements taken immediately after the charging cycle is completed. At this point, the battery voltage should be very close to 4.2V, which corresponds to a 100% SOC. This ensures accurate re-calibration of the fuel gauge for subsequent SOC predictions during discharge mode.

RE: SoC values after battery profiling

robsrick — Mon, 18 Nov 2024 16:06:11 GMT

so the fuel gauge re-init should ensure it charges to 100%?

RE: SoC values after battery profiling

ketiljo — Mon, 18 Nov 2024 15:11:57 GMT

Can you re-initialize the fuel gauge after charging is completed? You can use the charge complete event from the NPM1300 to trigger the fuel gauge re-initialization. (nrf_fuel_gauge_init)

In future NCS update we are trying to address this fuel gauge re-initialization from the library itself after charging completed event.

The VBAT cap is there it helps to avoid transients for ex. when taking fuel gauge battery measurements.

RE: SoC values after battery profiling

robsrick — Mon, 18 Nov 2024 11:11:20 GMT

[00:00:00.109,55[00:00:53.391,693] <inf> nept_tApplication: Battery Charging
[00:00:53.466,369] <inf> nept_tApplication: Application State: Sleep
[00:00:58.397,094] <inf> nept_fuel_gauge: V: 4.091, I: 0.002, T: 15.74, 
[00:00:58.397,125] <inf> nept_fuel_gauge: SoC: 92.90, TTE: nan, TTF: nan
[00:01:03.402,770] <inf> nept_fuel_gauge: V: 4.218, I: -0.306, T: 15.74, 
[00:01:03.402,801] <inf> nept_fuel_gauge: SoC: 92.90, TTE: nan, TTF: nan
[00:01:08.408,416] <inf> nept_fuel_gauge: V: 4.218, I: -0.279, T: 15.84, 
[00:01:08.408,477] <inf> nept_fuel_gauge: SoC: 92.99, TTE: nan, TTF: nan
[00:01:13.414,093] <inf> nept_fuel_gauge: V: 4.218, I: -0.271, T: 15.84, 
[00:01:13.414,123] <inf> nept_fuel_gauge: SoC: 93.08, TTE: nan, TTF: nan
[00:01:18.419,738] <inf> nept_fuel_gauge: V: 4.218, I: -0.251, T: 15.84, 
[00:01:18.419,769] <inf> nept_fuel_gauge: SoC: 93.16, TTE: nan, TTF: nan
[00:01:23.425,384] <inf> nept_fuel_gauge: V: 4.218, I: -0.242, T: 15.94, 
[00:01:23.425,415] <inf> nept_fuel_gauge: SoC: 93.24, TTE: nan, TTF: nan
[00:01:28.431,030] <inf> nept_fuel_gauge: V: 4.218, I: -0.232, T: 15.94, 
[00:01:28.431,060] <inf> nept_fuel_gauge: SoC: 93.31, TTE: nan, TTF: nan
[00:01:33.436,645] <inf> nept_fuel_gauge: V: 4.218, I: -0.229, T: 15.94, 
[00:01:33.436,706] <inf> nept_fuel_gauge: SoC: 93.38, TTE: nan, TTF: nan
[00:01:38.442,321] <inf> nept_fuel_gauge: V: 4.218, I: -0.217, T: 16.04, 
[00:01:38.442,352] <inf> nept_fuel_gauge: SoC: 93.45, TTE: nan, TTF: nan
[00:01:43.447,998] <inf> nept_fuel_gauge: V: 4.218, I: -0.217, T: 16.04, 
[00:01:43.448,028] <inf> nept_fuel_gauge: SoC: 93.52, TTE: nan, TTF: nan
[00:01:48.453,674] <inf> nept_fuel_gauge: V: 4.213, I: -0.215, T: 16.04, 
[00:01:48.453,704] <inf> nept_fuel_gauge: SoC: 93.58, TTE: nan, TTF: nan
[00:01:53.459,320] <inf> nept_fuel_gauge: V: 4.218, I: -0.202, T: 16.14, 
[00:01:53.459,350] <inf> nept_fuel_gauge: SoC: 93.65, TTE: nan, TTF: nan
[00:01:58.464,996] <inf> nept_fuel_gauge: V: 4.218, I: -0.203, T: 16.14, 
[00:01:58.465,026] <inf> nept_fuel_gauge: SoC: 93.71, TTE: nan, TTF: nan
[00:02:03.470,672] <inf> nept_fuel_gauge: V: 4.218, I: -0.199, T: 16.14, 
[00:02:03.470,703] <inf> nept_fuel_gauge: SoC: 93.77, TTE: nan, TTF: nan
[00:02:08.476,318] <inf> nept_fuel_gauge: V: 4.218, I: -0.197, T: 16.14, 
[00:02:08.476,348] <inf> nept_fuel_gauge: SoC: 93.83, TTE: nan, TTF: nan
[00:02:13.481,933] <inf> nept_fuel_gauge: V: 4.218, I: -0.194, T: 16.24, 
[00:02:13.481,994] <inf> nept_fuel_gauge: SoC: 93.89, TTE: nan, TTF: nan
[00:02:18.487,579] <inf> nept_fuel_gauge: V: 4.218, I: -0.190, T: 16.24, 
[00:02:18.487,640] <inf> nept_fuel_gauge: SoC: 93.95, TTE: nan, TTF: nan
[00:02:23.493,225] <inf> nept_fuel_gauge: V: 4.218, I: -0.184, T: 16.24, 
[00:02:23.493,286] <inf> nept_fuel_gauge: SoC: 94.00, TTE: nan, TTF: nan
[00:02:28.498,870] <inf> nept_fuel_gauge: V: 4.218, I: -0.182, T: 16.24, 
[00:02:28.498,931] <inf> nept_fuel_gauge: SoC: 94.06, TTE: nan, TTF: nan
[00:02:33.504,516] <inf> nept_fuel_gauge: V: 4.218, I: -0.181, T: 16.24, 
[00:02:33.504,547] <inf> nept_fuel_gauge: SoC: 94.11, TTE: nan, TTF: nan
[00:02:38.510,162] <inf> nept_fuel_gauge: V: 4.218, I: -0.175, T: 16.24, 
[00:02:38.510,223] <inf> nept_fuel_gauge: SoC: 94.17, TTE: nan, TTF: nan
[00:02:43.515,808] <inf> nept_fuel_gauge: V: 4.218, I: -0.170, T: 16.24, 
[00:02:43.515,869] <inf> nept_fuel_gauge: SoC: 94.22, TTE: nan, TTF: nan
[00:02:48.521,453] <inf> nept_fuel_gauge: V: 4.218, I: -0.171, T: 16.24, 
[00:02:48.521,514] <inf> nept_fuel_gauge: SoC: 94.27, TTE: nan, TTF: nan
[00:02:53.527,099] <inf> nept_fuel_gauge: V: 4.218, I: -0.170, T: 16.24, 
[00:02:53.527,160] <inf> nept_fuel_gauge: SoC: 94.32, TTE: nan, TTF: nan
[00:02:58.532,745] <inf> nept_fuel_gauge: V: 4.218, I: -0.169, T: 16.24, 
[00:02:58.532,806] <inf> nept_fuel_gauge: SoC: 94.38, TTE: nan, TTF: nan
[00:03:03.538,482] <inf> nept_fuel_gauge: V: 4.218, I: -0.164, T: 16.34, 
[00:03:03.538,513] <inf> nept_fuel_gauge: SoC: 94.43, TTE: nan, TTF: 558
[00:03:08.544,219] <inf> nept_fuel_gauge: V: 4.218, I: -0.166, T: 16.34, 
[00:03:08.544,250] <inf> nept_fuel_gauge: SoC: 94.48, TTE: nan, TTF: 558
[00:03:13.549,957] <inf> nept_fuel_gauge: V: 4.218, I: -0.162, T: 16.34, 
[00:03:13.549,987] <inf> nept_fuel_gauge: SoC: 94.53, TTE: nan, TTF: 555
[00:03:18.555,664] <inf> nept_fuel_gauge: V: 4.218, I: -0.160, T: 16.34, 
[00:03:18.555,694] <inf> nept_fuel_gauge: SoC: 94.57, TTE: nan, TTF: 554
[00:03:23.561,401] <inf> nept_fuel_gauge: V: 4.218, I: -0.154, T: 16.34, 
[00:03:23.561,431] <inf> nept_fuel_gauge: SoC: 94.62, TTE: nan, TTF: 550
[00:03:28.567,138] <inf> nept_fuel_gauge: V: 4.218, I: -0.153, T: 16.34, 
[00:03:28.567,169] <inf> nept_fuel_gauge: SoC: 94.67, TTE: nan, TTF: 549
[00:03:33.572,875] <inf> nept_fuel_gauge: V: 4.218, I: -0.150, T: 16.34, 
[00:03:33.572,906] <inf> nept_fuel_gauge: SoC: 94.72, TTE: nan, TTF: 546
[00:03:38.578,582] <inf> nept_fuel_gauge: V: 4.218, I: -0.150, T: 16.34, 
[00:03:38.578,613] <inf> nept_fuel_gauge: SoC: 94.76, TTE: nan, TTF: 546
[00:03:43.584,320] <inf> nept_fuel_gauge: V: 4.218, I: -0.150, T: 16.34, 
[00:03:43.584,350] <inf> nept_fuel_gauge: SoC: 94.81, TTE: nan, TTF: 545
[00:03:48.590,057] <inf> nept_fuel_gauge: V: 4.218, I: -0.147, T: 16.44, 
[00:03:48.590,087] <inf> nept_fuel_gauge: SoC: 94.85, TTE: nan, TTF: 542
[00:03:53.595,794] <inf> nept_fuel_gauge: V: 4.218, I: -0.147, T: 16.34, 
[00:03:53.595,825] <inf> nept_fuel_gauge: SoC: 94.90, TTE: nan, TTF: 541
[00:03:58.601,531] <inf> nept_fuel_gauge: V: 4.218, I: -0.142, T: 16.44, 
[00:03:58.601,562] <inf> nept_fuel_gauge: SoC: 94.94, TTE: nan, TTF: 537
[00:04:03.607,269] <inf> nept_fuel_gauge: V: 4.218, I: -0.143, T: 16.44, 
[00:04:03.607,299] <inf> nept_fuel_gauge: SoC: 94.98, TTE: nan, TTF: 537
[00:04:08.613,006] <inf> nept_fuel_gauge: V: 4.218, I: -0.138, T: 16.44, 
[00:04:08.613,037] <inf> nept_fuel_gauge: SoC: 95.03, TTE: nan, TTF: 533
[00:04:13.618,743] <inf> nept_fuel_gauge: V: 4.218, I: -0.140, T: 16.44, 
[00:04:13.618,774] <inf> nept_fuel_gauge: SoC: 95.07, TTE: nan, TTF: 533
[00:04:18.624,481] <inf> nept_fuel_gauge: V: 4.218, I: -0.136, T: 16.44, 
[00:04:18.624,511] <inf> nept_fuel_gauge: SoC: 95.11, TTE: nan, TTF: 530
[00:04:23.630,218] <inf> nept_fuel_gauge: V: 4.218, I: -0.132, T: 16.34, 
[00:04:23.630,249] <inf> nept_fuel_gauge: SoC: 95.15, TTE: nan, TTF: 527
[00:04:28.635,925] <inf> nept_fuel_gauge: V: 4.218, I: -0.134, T: 16.44, 
[00:04:28.635,955] <inf> nept_fuel_gauge: SoC: 95.19, TTE: nan, TTF: 527
[00:04:33.641,662] <inf> nept_fuel_gauge: V: 4.218, I: -0.132, T: 16.44, 
[00:04:33.641,693] <inf> nept_fuel_gauge: SoC: 95.24, TTE: nan, TTF: 525
[00:04:38.647,399] <inf> nept_fuel_gauge: V: 4.218, I: -0.132, T: 16.44, 
[00:04:38.647,430] <inf> nept_fuel_gauge: SoC: 95.28, TTE: nan, TTF: 524
[00:04:43.653,137] <inf> nept_fuel_gauge: V: 4.218, I: -0.129, T: 16.44, 
[00:04:43.653,167] <inf> nept_fuel_gauge: SoC: 95.32, TTE: nan, TTF: 521
[00:04:48.658,874] <inf> nept_fuel_gauge: V: 4.218, I: -0.127, T: 16.44, 
[00:04:48.658,905] <inf> nept_fuel_gauge: SoC: 95.36, TTE: nan, TTF: 519
[00:04:53.664,611] <inf> nept_fuel_gauge: V: 4.218, I: -0.126, T: 16.44, 
[00:04:53.664,642] <inf> nept_fuel_gauge: SoC: 95.39, TTE: nan, TTF: 517
[00:04:58.670,318] <inf> nept_fuel_gauge: V: 4.218, I: -0.124, T: 16.44, 
[00:04:58.670,349] <inf> nept_fuel_gauge: SoC: 95.43, TTE: nan, TTF: 514
[00:05:03.676,055] <inf> nept_fuel_gauge: V: 4.218, I: -0.124, T: 16.44, 
[00:05:03.676,086] <inf> nept_fuel_gauge: SoC: 95.47, TTE: nan, TTF: 513
[00:05:08.681,793] <inf> nept_fuel_gauge: V: 4.218, I: -0.123, T: 16.44, 
[00:05:08.681,823] <inf> nept_fuel_gauge: SoC: 95.51, TTE: nan, TTF: 512
[00:05:13.687,530] <inf> nept_fuel_gauge: V: 4.218, I: -0.121, T: 16.44, 
[00:05:13.687,561] <inf> nept_fuel_gauge: SoC: 95.55, TTE: nan, TTF: 509
[00:05:18.693,237] <inf> nept_fuel_gauge: V: 4.218, I: -0.119, T: 16.44, 
[00:05:18.693,267] <inf> nept_fuel_gauge: SoC: 95.58, TTE: nan, TTF: 507
[00:05:23.698,974] <inf> nept_fuel_gauge: V: 4.218, I: -0.117, T: 16.44, 
[00:05:23.699,005] <inf> nept_fuel_gauge: SoC: 95.62, TTE: nan, TTF: 504
[00:05:28.704,711] <inf> nept_fuel_gauge: V: 4.218, I: -0.119, T: 16.44, 
[00:05:28.704,742] <inf> nept_fuel_gauge: SoC: 95.66, TTE: nan, TTF: 504
[00:05:33.710,449] <inf> nept_fuel_gauge: V: 4.218, I: -0.116, T: 16.44, 
[00:05:33.710,479] <inf> nept_fuel_gauge: SoC: 95.69, TTE: nan, TTF: 501
[00:05:38.716,156] <inf> nept_fuel_gauge: V: 4.218, I: -0.114, T: 16.44, 
[00:05:38.716,186] <inf> nept_fuel_gauge: SoC: 95.73, TTE: nan, TTF: 498
[00:05:43.721,893] <inf> nept_fuel_gauge: V: 4.218, I: -0.114, T: 16.44, 
[00:05:43.721,923] <inf> nept_fuel_gauge: SoC: 95.76, TTE: nan, TTF: 497
[00:05:48.727,630] <inf> nept_fuel_gauge: V: 4.218, I: -0.113, T: 16.44, 
[00:05:48.727,661] <inf> nept_fuel_gauge: SoC: 95.80, TTE: nan, TTF: 495
[00:05:53.733,367] <inf> nept_fuel_gauge: V: 4.218, I: -0.111, T: 16.44, 
[00:05:53.733,398] <inf> nept_fuel_gauge: SoC: 95.83, TTE: nan, TTF: 493
[00:05:58.739,074] <inf> nept_fuel_gauge: V: 4.218, I: -0.111, T: 16.44, 
[00:05:58.739,105] <inf> nept_fuel_gauge: SoC: 95.87, TTE: nan, TTF: 491
[00:06:03.744,812] <inf> nept_fuel_gauge: V: 4.218, I: -0.108, T: 16.44, 
[00:06:03.744,842] <inf> nept_fuel_gauge: SoC: 95.90, TTE: nan, TTF: 488
[00:06:08.750,549] <inf> nept_fuel_gauge: V: 4.218, I: -0.107, T: 16.44, 
[00:06:08.750,579] <inf> nept_fuel_gauge: SoC: 95.94, TTE: nan, TTF: 486
[00:06:13.756,286] <inf> nept_fuel_gauge: V: 4.218, I: -0.105, T: 16.44, 
[00:06:13.756,317] <inf> nept_fuel_gauge: SoC: 95.97, TTE: nan, TTF: 483
[00:06:18.761,993] <inf> nept_fuel_gauge: V: 4.218, I: -0.102, T: 16.44, 
[00:06:18.762,023] <inf> nept_fuel_gauge: SoC: 96.00, TTE: nan, TTF: 480
[00:06:23.767,730] <inf> nept_fuel_gauge: V: 4.218, I: -0.105, T: 16.54, 
[00:06:23.767,761] <inf> nept_fuel_gauge: SoC: 96.03, TTE: nan, TTF: 481
[00:06:28.773,437] <inf> nept_fuel_gauge: V: 4.218, I: -0.104, T: 16.44, 
[00:06:28.773,468] <inf> nept_fuel_gauge: SoC: 96.07, TTE: nan, TTF: 479
[00:06:33.779,174] <inf> nept_fuel_gauge: V: 4.218, I: -0.102, T: 16.54, 
[00:06:33.779,205] <inf> nept_fuel_gauge: SoC: 96.10, TTE: nan, TTF: 476
[00:06:38.784,912] <inf> nept_fuel_gauge: V: 4.218, I: -0.101, T: 16.54, 
[00:06:38.784,942] <inf> nept_fuel_gauge: SoC: 96.13, TTE: nan, TTF: 474
[00:06:43.790,649] <inf> nept_fuel_gauge: V: 4.218, I: -0.100, T: 16.54, 
[00:06:43.790,679] <inf> nept_fuel_gauge: SoC: 96.16, TTE: nan, TTF: 472
[00:06:48.796,325] <inf> nept_fuel_gauge: V: 4.218, I: -0.096, T: 16.54, 
[00:06:48.796,386] <inf> nept_fuel_gauge: SoC: 96.19, TTE: nan, TTF: 468
[00:06:53.802,062] <inf> nept_fuel_gauge: V: 4.218, I: -0.093, T: 16.54, 
[00:06:53.802,093] <inf> nept_fuel_gauge: SoC: 96.22, TTE: nan, TTF: 464
[00:06:58.807,800] <inf> nept_fuel_gauge: V: 4.218, I: -0.097, T: 16.44, 
[00:06:58.807,830] <inf> nept_fuel_gauge: SoC: 96.25, TTE: nan, TTF: 466
[00:07:03.813,537] <inf> nept_fuel_gauge: V: 4.218, I: -0.093, T: 16.54, 
[00:07:03.813,568] <inf> nept_fuel_gauge: SoC: 96.28, TTE: nan, TTF: 462
[00:07:08.819,274] <inf> nept_fuel_gauge: V: 4.218, I: -0.091, T: 16.54, 
[00:07:08.819,305] <inf> nept_fuel_gauge: SoC: 96.31, TTE: nan, TTF: 459
[00:07:13.825,012] <inf> nept_fuel_gauge: V: 4.218, I: -0.093, T: 16.54, 
[00:07:13.825,042] <inf> nept_fuel_gauge: SoC: 96.34, TTE: nan, TTF: 460
[00:07:18.830,749] <inf> nept_fuel_gauge: V: 4.218, I: -0.091, T: 16.54, 
[00:07:18.830,780] <inf> nept_fuel_gauge: SoC: 96.37, TTE: nan, TTF: 457
[00:07:23.836,486] <inf> nept_fuel_gauge: V: 4.218, I: -0.089, T: 16.54, 
[00:07:23.836,517] <inf> nept_fuel_gauge: SoC: 96.40, TTE: nan, TTF: 454
[00:07:28.842,224] <inf> nept_fuel_gauge: V: 4.218, I: -0.090, T: 16.54, 
[00:07:28.842,254] <inf> nept_fuel_gauge: SoC: 96.43, TTE: nan, TTF: 453
[00:07:33.847,961] <inf> nept_fuel_gauge: V: 4.218, I: -0.088, T: 16.44, 
[00:07:33.847,991] <inf> nept_fuel_gauge: SoC: 96.46, TTE: nan, TTF: 450
[00:07:38.853,698] <inf> nept_fuel_gauge: V: 4.218, I: -0.089, T: 16.54, 
[00:07:38.853,729] <inf> nept_fuel_gauge: SoC: 96.49, TTE: nan, TTF: 450
[00:07:43.859,436] <inf> nept_fuel_gauge: V: 4.218, I: -0.085, T: 16.54, 
[00:07:43.859,466] <inf> nept_fuel_gauge: SoC: 96.51, TTE: nan, TTF: 445
[00:07:48.865,173] <inf> nept_fuel_gauge: V: 4.218, I: -0.085, T: 16.44, 
[00:07:48.865,203] <inf> nept_fuel_gauge: SoC: 96.54, TTE: nan, TTF: 444
[00:07:53.870,880] <inf> nept_fuel_gauge: V: 4.218, I: -0.086, T: 16.54, 
[00:07:53.870,910] <inf> nept_fuel_gauge: SoC: 96.57, TTE: nan, TTF: 444
[00:07:58.876,556] <inf> nept_fuel_gauge: V: 4.218, I: -0.086, T: 16.54, 
[00:07:58.876,617] <inf> nept_fuel_gauge: SoC: 96.59, TTE: nan, TTF: 442
[00:08:03.882,293] <inf> nept_fuel_gauge: V: 4.218, I: -0.085, T: 16.54, 
[00:08:03.882,293] <inf> nept_fuel_gauge: SoC: 96.62, TTE: nan, TTF: 440
[00:08:08.888,000] <inf> nept_fuel_gauge: V: 4.218, I: -0.083, T: 16.54, 
[00:08:08.888,031] <inf> nept_fuel_gauge: SoC: 96.65, TTE: nan, TTF: 437
[00:08:13.893,737] <inf> nept_fuel_gauge: V: 4.218, I: -0.082, T: 16.44, 
[00:08:13.893,768] <inf> nept_fuel_gauge: SoC: 96.68, TTE: nan, TTF: 435
[00:08:18.899,444] <inf> nept_fuel_gauge: V: 4.218, I: -0.079, T: 16.44, 
[00:08:18.899,505] <inf> nept_fuel_gauge: SoC: 96.70, TTE: nan, TTF: 431
[00:08:23.905,181] <inf> nept_fuel_gauge: V: 4.218, I: -0.081, T: 16.54, 
[00:08:23.905,212] <inf> nept_fuel_gauge: SoC: 96.73, TTE: nan, TTF: 432
[00:08:28.910,858] <inf> nept_fuel_gauge: V: 4.218, I: -0.080, T: 16.54, 
[00:08:28.910,888] <inf> nept_fuel_gauge: SoC: 96.75, TTE: nan, TTF: 429
[00:08:33.916,564] <inf> nept_fuel_gauge: V: 4.218, I: -0.080, T: 16.54, 
[00:08:33.916,595] <inf> nept_fuel_gauge: SoC: 96.78, TTE: nan, TTF: 428
[00:08:38.922,271] <inf> nept_fuel_gauge: V: 4.213, I: -0.080, T: 16.54, 
[00:08:38.922,302] <inf> nept_fuel_gauge: SoC: 96.80, TTE: nan, TTF: 427
[00:08:43.928,009] <inf> nept_fuel_gauge: V: 4.218, I: -0.076, T: 16.54, 
[00:08:43.928,039] <inf> nept_fuel_gauge: SoC: 96.83, TTE: nan, TTF: 422
[00:08:48.933,746] <inf> nept_fuel_gauge: V: 4.218, I: -0.077, T: 16.44, 
[00:08:48.933,776] <inf> nept_fuel_gauge: SoC: 96.85, TTE: nan, TTF: 421
[00:08:53.939,453] <inf> nept_fuel_gauge: V: 4.213, I: -0.079, T: 16.54, 
[00:08:53.939,514] <inf> nept_fuel_gauge: SoC: 96.88, TTE: nan, TTF: 422
[00:08:58.945,190] <inf> nept_fuel_gauge: V: 4.218, I: -0.076, T: 16.44, 
[00:08:58.945,220] <inf> nept_fuel_gauge: SoC: 96.90, TTE: nan, TTF: 418
[00:09:03.950,927] <inf> nept_fuel_gauge: V: 4.218, I: -0.076, T: 16.44, 
[00:09:03.950,958] <inf> nept_fuel_gauge: SoC: 96.93, TTE: nan, TTF: 416
[00:09:08.956,665] <inf> nept_fuel_gauge: V: 4.218, I: -0.072, T: 16.54, 
[00:09:08.956,695] <inf> nept_fuel_gauge: SoC: 96.95, TTE: nan, TTF: 411
[00:09:13.962,371] <inf> nept_fuel_gauge: V: 4.218, I: -0.074, T: 16.44, 
[00:09:13.962,402] <inf> nept_fuel_gauge: SoC: 96.98, TTE: nan, TTF: 412
[00:09:18.968,109] <inf> nept_fuel_gauge: V: 4.218, I: -0.070, T: 16.44, 
[00:09:18.968,139] <inf> nept_fuel_gauge: SoC: 97.00, TTE: nan, TTF: 406
[00:09:23.973,846] <inf> nept_fuel_gauge: V: 4.218, I: -0.070, T: 16.44, 
[00:09:23.973,876] <inf> nept_fuel_gauge: SoC: 97.02, TTE: nan, TTF: 405
[00:09:28.979,583] <inf> nept_fuel_gauge: V: 4.218, I: -0.069, T: 16.44, 
[00:09:28.979,614] <inf> nept_fuel_gauge: SoC: 97.05, TTE: nan, TTF: 403
[00:09:33.985,321] <inf> nept_fuel_gauge: V: 4.218, I: -0.070, T: 16.44, 
[00:09:33.985,351] <inf> nept_fuel_gauge: SoC: 97.07, TTE: nan, TTF: 403
[00:09:38.991,058] <inf> nept_fuel_gauge: V: 4.218, I: -0.071, T: 16.44, 
[00:09:38.991,088] <inf> nept_fuel_gauge: SoC: 97.09, TTE: nan, TTF: 402
[00:09:43.996,765] <inf> nept_fuel_gauge: V: 4.218, I: -0.068, T: 16.44, 
[00:09:43.996,795] <inf> nept_fuel_gauge: SoC: 97.12, TTE: nan, TTF: 398
[00:09:49.002,471] <inf> nept_fuel_gauge: V: 4.218, I: -0.064, T: 16.44, 
[00:09:49.002,502] <inf> nept_fuel_gauge: SoC: 97.14, TTE: nan, TTF: 392
[00:09:54.008,178] <inf> nept_fuel_gauge: V: 4.218, I: -0.068, T: 16.44, 
[00:09:54.008,209] <inf> nept_fuel_gauge: SoC: 97.16, TTE: nan, TTF: 395
[00:09:59.013,916] <inf> nept_fuel_gauge: V: 4.218, I: -0.067, T: 16.44, 
[00:09:59.013,946] <inf> nept_fuel_gauge: SoC: 97.18, TTE: nan, TTF: 393
[00:10:04.019,653] <inf> nept_fuel_gauge: V: 4.218, I: -0.065, T: 16.44, 
[00:10:04.019,683] <inf> nept_fuel_gauge: SoC: 97.20, TTE: nan, TTF: 389
[00:10:09.025,360] <inf> nept_fuel_gauge: V: 4.218, I: -0.060, T: 16.44, 
[00:10:09.025,390] <inf> nept_fuel_gauge: SoC: 97.22, TTE: nan, TTF: 382
[00:10:14.031,097] <inf> nept_fuel_gauge: V: 4.218, I: -0.063, T: 16.44, 
[00:10:14.031,127] <inf> nept_fuel_gauge: SoC: 97.24, TTE: nan, TTF: 385
[00:10:19.036,834] <inf> nept_fuel_gauge: V: 4.218, I: -0.062, T: 16.44, 
[00:10:19.036,865] <inf> nept_fuel_gauge: SoC: 97.27, TTE: nan, TTF: 383
[00:10:24.042,572] <inf> nept_fuel_gauge: V: 4.218, I: -0.064, T: 16.44, 
[00:10:24.042,602] <inf> nept_fuel_gauge: SoC: 97.29, TTE: nan, TTF: 384
[00:10:29.048,309] <inf> nept_fuel_gauge: V: 4.223, I: -0.062, T: 16.44, 
[00:10:29.048,339] <inf> nept_fuel_gauge: SoC: 97.31, TTE: nan, TTF: 380
[00:10:34.054,016] <inf> nept_fuel_gauge: V: 4.218, I: -0.062, T: 16.44, 
[00:10:34.054,046] <inf> nept_fuel_gauge: SoC: 97.33, TTE: nan, TTF: 379
[00:10:39.059,722] <inf> nept_fuel_gauge: V: 4.218, I: -0.060, T: 16.44, 
[00:10:39.059,753] <inf> nept_fuel_gauge: SoC: 97.35, TTE: nan, TTF: 375
[00:10:44.065,429] <inf> nept_fuel_gauge: V: 4.218, I: -0.060, T: 16.34, 
[00:10:44.065,460] <inf> nept_fuel_gauge: SoC: 97.37, TTE: nan, TTF: 374
[00:10:49.071,136] <inf> nept_fuel_gauge: V: 4.218, I: -0.059, T: 16.44, 
[00:10:49.071,166] <inf> nept_fuel_gauge: SoC: 97.39, TTE: nan, TTF: 371
[00:10:54.076,843] <inf> nept_fuel_gauge: V: 4.218, I: -0.057, T: 16.34, 
[00:10:54.076,873] <inf> nept_fuel_gauge: SoC: 97.41, TTE: nan, TTF: 368
[00:10:59.082,550] <inf> nept_fuel_gauge: V: 4.223, I: -0.056, T: 16.44, 
[00:10:59.082,580] <inf> nept_fuel_gauge: SoC: 97.42, TTE: nan, TTF: 366
[00:11:04.088,256] <inf> nept_fuel_gauge: V: 4.218, I: -0.058, T: 16.44, 
[00:11:04.088,317] <inf> nept_fuel_gauge: SoC: 97.44, TTE: nan, TTF: 369
[00:11:09.093,994] <inf> nept_fuel_gauge: V: 4.218, I: -0.056, T: 16.44, 
[00:11:09.094,024] <inf> nept_fuel_gauge: SoC: 97.45, TTE: nan, TTF: 366
[00:11:09.098,205] <inf> nept_tApplication: Battery Charged
[00:11:09.098,205] <inf> nept_tApplication: Application State: Sleep

Here's the log for charging from 93% up to 100(ish)%

It gets up to 97.45% then stops charging. I guess it's hitting the current threshold in constant voltage mode and switching off charging, but why is it only at ~98% and not 100%?

The LED status error was something on my end, it looks like the charge complete event from the NPM1300 does actually trigger, so don't worry about that bit.

I am using the battery NTC, but temps look ok from what i've seen.

Could you explain the purpose of the cap on VBat, is this likely to lead to unstable battery readings if not present?

Regards
Robert

RE: SoC values after battery profiling

ketiljo — Mon, 18 Nov 2024 10:25:28 GMT

Are you using a NTC on the battery?

Can you get the output values from the Fuel gauge library. This will be helpful in debugging. It should contain battery voltage, current, temperature and SOC value.

You can also use this function https://docs.nordicsemi.com/bundle/nrfxlib-apis-latest/page/structnrf_fuel_gauge_state_info.html#details

The capacitor on VBAT is mandatory so you need to add this.

Also since you areusing the events from the NPM1300 to control the LED status, you could also Read BCHGCHARGESTATUS register COMPLETED bit to determine the charging completed status: https://docs.nordicsemi.com/bundle/ps_npm1300/page/chapters/charger.html#ariaid-title46