Part Number:BQ27421-G1
We are developing a product that, depending on the configuration of the product, can be fitted with a
- 4.2V battery (1250mAh) or a
- 4.35V (3000mAh) battery.
The 4.2V(1250mAh) cell is used as a surge battery when the product is powered (to supplement limited limited USB power) and is not intended to be "visible" to the end user. SOC accuracy is not so important.
The 4.35V(3000mAh) cell is used when the product is configured as a mobile device where the end-user will be aware of SOC as it will be displayed on the screen.
We do not have the option of having 2 variants of PCB assembly (i.e. we cannot build some with BQ27421-G1A and some with BQ27421-G1B )
What will be the impact of using a bq27421-G1B gauge (designed for 4.3/4.35V) with a 4.2V cell? Will it just be an accuracy issue with the SOC value? If so is this quantifiable?
support@ti.com suggested I ask this question here.
Thanks.