Beautiful, almost cool, 70f degree day while deep cycling six tb48s.. Had warning set to 15% and critical at 10%. All batteries charged to 100%. Four battery drains were perfect. Kept her up about 6-8 inches until all cells were just below 3.3 On two of the batteries though both at about 40 total charges, I received a warning, "Overheating During Discharge". One right at the 3.34 range and the other just a little higher, battery temp was at 69c-71c. One of them just dipped below 3.30 across the six as I brought it all of the way down. The other completed turned off and dropped about 8 inches. No damage, however obviously now wary of both batteries. Any thoughts or insight is appreciated.