Well guys here's an update.
I charged the battery to 100% yesterday and got the 3rd LED flashing twice per second. Today I connected it to my mavic and let it just sit there until it got to about 45%. I had noticed that the cells levelled off around this percent and thought they might charge up at the same level as well from here. I let the battery cool down well ( I left the battery for a few hours ). Now I've just charged the battery up and the 3rd LED is NOT blinking. Hopefully it stays this way now. I will defo be keeping a close eye on battery info during my flights now.
I will test the battery again soon and monitor the cell performance and post an update. Fingers crossed.