Looking into a supply problem, I stumbled across a very interesting website, it is the Yuasa battery company, you must have seen their product all over the placeThey go quite deeply into battery construction and some of the advantages and disadvantages that go with them. later on in the site they go into charrging and how to go about it safelyI recommend all modellers to read it and inwardly digest all the good words there. I am sure it will drasticly reduce the number of heart rending stories of models being lostand ESC’s glowing in the dark. DO remember that the information refers to yuasa batteries only, and not the lithium polymer batteries in some of the latest helicopters. When you read it, think “How does this apply to me”?. Avoid fast charging unless the leaflet that came with the batteries says you can. IMpatience can be very expensive