Hi team,
The battery is marked with a capacity of 1500 mAh and a full charge of 4.2 V. A discharge current of 0.1C is required to make the chemistry ID, i.e. 150mA discharge to 3V cut off voltage. The actual discharge time is about 6h, but it should theoretically be close to 10 hours. Will there be an error in the chemistry ID measured this way? Is it required to reduce the discharge current to ensure the discharge time is close to 10 hours?
Below is a report of 150mA discharge current for chemistry ID:
Chemistry ID selection tool, rev=2.54 Configuration used in present fit: ProcessingType=2 NumCellSeries=1 ElapsedTimeColumn=0 VoltageColumn=1 TemperatureColumn=2 CurrentColumn=3 Best chemical ID : 3717 Best chemical ID max. deviation, % : 1.85 Summary of all IDs with max. DOD deviation below 3% Chem ID max DOD error, % Max R deviation, ratio 3717 1.85 0.16 2684 1.98 0.19 2021 2 0.44 5691 2.04 0.5 1211 2.04 0.26 204 2.11 0.43 1320 2.15 0.44 106 2.21 0.11 2582 2.22 0.24 5432 2.22 0.48 2005 2.23 0.13 1139 2.24 0.05 1343 2.26 0.22 260 2.28 0.78 3607 2.28 0.53 5267 2.29 0.09 3720 2.3 0.71 1151 2.3 0.07 2022 2.33 0.31 113 2.4 0.48 1223 2.43 0.25 1270 2.46 0.05 250 2.46 0.07 5220 2.48 0.09 5605 2.49 0.13 2064 2.5 0.95 281 2.51 0.03 181 2.52 0.06 1110 2.53 0.15 2987 2.54 0.23 2459 2.56 0.76 1154 2.58 0.47 2274 2.59 0.18 1309 2.62 0.42 1348 2.62 0.28 257 2.64 0.1 528 2.65 0.02 2108 2.67 0.57 2404 2.67 0.02 234 2.69 0.04 235 2.71 0.04 1976 2.73 0.52 1128 2.74 0.04 2702 2.76 0.05 264 2.81 0.05 2148 2.83 0.01 1241 2.83 0.06 258 2.84 0.02 1204 2.85 0.64 2143 2.88 0.28 285 2.88 0.08 1341 2.89 0.13 5345 2.9 0.09 1243 2.91 0.09 2011 2.93 0.24 1217 2.93 0.09 5379 2.94 0.22 2129 2.94 0.22 2128 2.95 0.02 101 2.97 0.77 2040 2.99 0.04 2153 2.99 0.05 243 2.99 0.13 Max. deviations for best ID is within recommended range. Chosen best chemical ID is suitable for programming the gauge. Selection of best generic ID for ROM based devices like bq274xx Device / Family #1 Generic Chem ID Device/ Voltage/ Chemistry max DOD error, % 128 bq27421-G1A: 4.2V LiCoO2 3.39 354 bq27411-G1C: 4.35V LiCoO2 3.78 312 bq27421-G1B: 4.3V LiCoO2 3.83 3142 bq27421-G1D: 4.4V LiCoO2 3.94 Best generic ID 128 Max. deviations for best generic ID is within recommended range. Please chose this ID in your device configuration or device family. Device / Family #2 Generic Chem ID Device/ Voltage/ Chemistry max DOD error, % 1210 bq27621: (ALT_CHEM1) 4.3V LiCoO2 3.37 1202 bq27621: (default) 4.2V LiCoO2 3.49 354 bq27621: (ALT_CHEM2) 4.35V LiCoO2 3.78 Best generic ID 1210 Max. deviations for best generic ID is within recommended range. Please chose this ID in your device configuration or device family. Device / Family #3 Generic Chem ID Device/ Voltage/ Chemistry max DOD error, % 3230 bq27426: (default) 4.35V LiCoO2 3.48 1202 bq27426: (ALT_CHEM1) 4.2V LiCoO2 3.49 3142 bq27426: (ALT-CHEM2) 4.4V LiCoO2 3.94 Best generic ID 3230 Max. deviations for best generic ID is within recommended range. Please chose this ID in your device configuration or device family. Warning: Discharge rate is too high. High rate reduces ID detection accuracy 10 hr rate is recomeended. Total discharge time is less than 5 hrs t_hrs= 2.78906527777778
Could you help check this case? Thanks.
Best Regards,
Cherry
