You overcharged it and overheated the pack it seems.

If this is a New pack, you should have charged at C/10 for first few cycles... and should not have exceeded 1.2A for quick charge after that.

Quick Charge a new pack (1200mah) at 1.4 and then trickle at 85mA is just asking for trouble in my opinion.. .... ... Then again, your pack might just have been faulty.


I charge my 1600 pack at 500mA the night before. You don't need to put it on trickle, you're not gonna loose much capacity over night.