We are using the fuel gauge along with a battery. Please find the below technical details
Fuel Gauge IC: MAX17201G+T
Current Battery Characteristics:
- HW Li-Ion 18650 25000mAH 3.7 V
- 92.5 Wh 2019I090003
- Width - 114.5mm Max
- Height - 70.0mm Max
- Thickness - 39.0mm Max
- Cable length - 195-205 mm
- Capacity - 30000mAh Typical/min
- Temperature - 0-45 C (Charge) , -20 to 60 C (discharge)
- Standard charge time - 6.5 hr
I have trained the fuel gauge with the above battery and prepared the fuel gauge calibration dataset. Now I am using the same calibrated data set on my device for the fuel gauge. Currently, I am facing issues with the Fuel Gauge output and suspecting the fuel gauge is not working properly.
Can anyone please respond to the below queries,
I am using the same battery as mentioned above, but have added an additional cable attached with a 6A/4A fuse between the battery and fuel gauge to limit the inrush current. Due to the fuse, the cable length is also increased here. Does adding a fuse and increasing the cable length can impact the fuel gauge reading/algorithm? Do I need to perform the training again with this setup to derive the calibration data set?
According to the fuel gauge datasheet, FullCapRep will be calculated at the end of every charge cycle in the application. It’s observed in my device that the fuel gauge was reporting FullCapRep value exactly equal to the RemCap value every time (Battery was not in a charging state). This behaviour is contradicting with the one mentioned in the datasheet. Under what circumstances can it behave like this?
It has been observed that the remaining capacity can drastically reduce from given value to zero with minimum time span. Is this behaviour expected with a properly working fuel gauge? If so, under what circumstances can it behave such?
I would really appreciate the help.