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Original question:

BQ27421-G1: Fuel gauge bq27421-G1 initialization

BQ27421-G1: Connecting/disconnecting battery from the IC

Julian Antonacci
Prodigy 70 points
Part Number: BQ27421-G1

Hello, I'm working on a battery charger with SOH data output to advise the user when the battery needs to be replaced.

I'll be using a 18650 3,350mAh battery but it will be disconnected every day from the cell gauge and will be connected again when the battery needs to be charged. If I initialize the fuel gauge with the four values each time the battery is reconnected, will I have an accurate SOH after charging?

If this fuel gauge is not the solution, can you please recommend me another one?

Thanks in advance, Julian.

  • 0
    TI__Mastermind 24870 points

    Hello Julian,

    In this use case it is better to use a pack side flash gauge.

    SOH computations rely on Qmax and Ra values as well. The ROM gauges need to be re-programmed and unless you are saving the Ra and Qmax values every time, the SOH computations could be off.