Hmm, no explanation of how it works as far as I could see (actually one of the linked evaluation articles reckons it pulls out impurities from the battery, another of the German ones said it increases the capacitance or some such). Yeah sounds like a likely story to me.
It says that it's been evaluated by a number of universities, but no links to their evaluations, etc. There is a link on the Zertificates page, to a test which was performed - however I don't think 2 tests with and 2 without the foil attached to a random battery can truly (or indeed at all) be called statistically significant.
Sounds like a load of rubbish to me, but I'd be happy to eat my words if someone points me to some better explanations/test results.
Cheers,
Si
