this is my first time trying protek lipo's... i ran smc for eb and 4wd sct, but for 13.5 4wd buggy I needed shortys and wanted higher c rating. so I bought 2 used team orion lipo's and one failed after a few weeks, but it was puffed some when i bought it. So I went and bought 2 new protek batteries and the specs were awesome for the price... but unfortunately I didn't use them when I got them really, so now its been to long to return them to amain.... I wish I would have checked them more last year...