Anyone Running a Lithium Battery on a Daily?

I’m running a 48AH lithium battery relocated to behind the pax seat. Low battery warning light pops up once started for 15 mins from cold or 5 mins warm and will not go off until restarted, not sure if it’s a problem with the alternator, wiring issues or the battery itself. But the car never died on me and it seems to be charging fine. It holds voltage from 13.2 - 13.5 after a day or two, multimeter shows 13.6 immediately started, and 13.93 after awhile of driving and seems to trigger the light at this voltage, 13.8x when every accessories are on...

OBD2 code came up with a P2502-N0E charging system voltage:network default