I can only comment by experience John - My Lithium Ion is charged with the standard alternator and has been used in my Saxo over the UK summer with absolutely no issues. The only difference with my set up is that the alternator is geared down slightly so it has less drag on the engine.
It was then left standing for 4months solid (engine was just turned over by hand) & battery was stored inside a warm house. I then came back at Christmas, checked the battery life and its was still on 100% - it started the engine first time. Lithium Ion doesn't suffer from memory loss - as posted above.
The Lithium Ion battery is Smaller, has 10x the cranking power/actual power & doesn't lose it's memory. So even if it was halved by 50% as you suggest it would STILL have 5x MORE than a conversional acid battery or Gel race battery AND It was weighs a lot less than the standard (Standard battery must be 8/9/10kg?) where as my lithium Ion weighs in @ 960grams - yes NOT even 1kg - and to save 8-9kg just by changing the battery for £150 is an absalute steal - every little bit helps.
Last edited by jpsaxo; 4th January 2013 at 20:12.
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