i have several rc vehicles over the years and ive owned lots of lipos including zippy,flightmax, some weird no name,hyperion,and maxamps lipos all have lasted over two years except for 4 packs that puffed up and went bad in under one years time............................ and all 4 that went bad prematurely were maxamps , i must admit maxamps did replace them for free after i sent them in to for warranty but the replacements also went bad in 6+ months. i would never buy them again because they just didn't last for me.