Have 2 SMC 5200mah, 3s batteries for the kraton. They've been in storage mode for most of the winter 3.6v. They charged up just fine, no issues! Went and ran the car in a parking lot for about 1/2 hr 45min, when I pulled batteries out to put on storage mode , noticed that one of the cases is splitting on the seem & I can squeeze it shut, but it just comes apart again. They were both in the 3.6-3.8 range after running.. Is it junk ?? There not even a year old and have around 15-20 runs.