Segway Lithium had been around for appx 9 years now, believe me there's not many experts around in this area, period.
First thing to understand the battery is the I2C can-bus communication which is related to your Red LED issue and ability to read and write the EEPROM to offset the aging cell, as you can adjust the offset to certain degree but never able revived a end of lifespan chemically exhausted cell.
Good luck with your experiments, be safe, remember, the energy it contains is able to travel 40+km with the weigh of you plus the Segway, any short circuit will result in serious consequences.
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