Hi all 2 years ago i purchased 2- 4s Giant power 5000 mah lipo's always stored at 60% in winter +cycle 3 time's during the off season never discharged them below 30% and never had them heat up more than 15 degrees over ambient temerature i had 1 pack go south last fall and the other one give out last week. They both swelled to twice there size both packs where barely warm when this happened i also use a stopwatch with a alarm i also use the blue Turnigy 4s 5000 mah 40c lipo's under the same parameters and never had any issues except the boats may be 4 mph slower than the Giant power lipo's. Has anyone else had this issue ? very frustrating cosidering the Giant power lipo's where 3x the price of the Turnigy's ! Regards Andris Golts.