Model L135F68 68ah 3.3v 72ah max inner resistance 02 to 0.5mohm size 135*29*199 Qualified for UN38.3 MSDS RoHS CE TUV UL with highsafety More than 2000 cycles under the designed working condition Ventilation slots for better cooling Battery shell material is flame retardant ldeal for HEsS or large-scale energy storage