I for one second that. After more testing last night on the rest of my dubious quality Chinese unbranded caps, all 220uf x 25v, I have had only one more failure, which occurred after about 10 mins on the 18v battery. As Pete suggested, the "burn-in period" was 2 hours. So, in short, the failure rate is about 20%. Acceptable considering the price I guess, and that my NCE system will not load these up beyond 13.8v and probably less than that as the 13.8 volts is what the NCE wall wart is rated at.