Andre Kesteloot writes: > > http://www.battech.co.uk/hob.htm If you like that, you'll like "Battery University": http://www.batteryuniversity.com/ Then add to that some reading on Supercapacitors http://en.wikipedia.org/wiki/Supercapacitor and Ultracapacitors http://www.maxwell.com/ultracapacitors/technical-support/faqs.asp -Maitland