EBR1190SX electrical problem

Battery warning came on during ride, eventually bike shutdown and battery melted. New antigravity battery fitted and first ride today. Battery warning came on for approximately 5 minutes and cleared - battery volts checked at 14.35 after fault. Further ride went great (120 km) until the last 4 km. Battery warning came on again, followed by the “O2 Heater System” fault code about 3 km later. Checked battery volts prior to turning it of and could not get anything to register. Turned the bike off and then back on and everything was fine - no engine fault, no battery warning and 14.35 volts. Temperature was hot 32 C and occurred when going slow.
anyone got any ideas on where to start?