I got 2 of these and installed one in my car, one in my brother's. He had a bad problem with flickering headlights and the capacitor immediately got rid of it by evening out the draw of electricity. After a few weeks though, the flicker is back, just not as bad as before. So apparently these lose a good deal of capacitance over time. It stil works and extensive testing has shown that it still holds a charge but it doesn't work like it used to. But for like 1/5th the price of some overpriced cap from Stinger, it's still worth it! My suggestion is just take the capacitance you estimate that you need and double it then buy accordingly. That way if it degrades, it still may be sufficient.
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