My take is that you bought yourself enough time to replace the battery before things go wonky again. I'm not 100% sure but I think 2.88 volts open circuit is low for a lithium cell.

M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39
M5HP, M40ti, Sierra-1
LFR1100 active, ADA1500-4 and -8