So recently I had mega battery issues with my x98 pro where the battery didn’t charge last 92% and the battery would drain in half hour but last much longer in the boot menu…. So the fix is simple if you have enough patience, no you do not need a new battery… or buy anything unless you don’t have a soldering iron…
Anyway all you need to do is disconnect the battery (all 3 wires) and use another wire to short the 3 holes on the charging board to make sure no power remains then put everything back together and boot up 🙂 this also solves calibration issues with the stock battery.