Yeah there is a fair amount of variation - and it's down to component tollerances I suspect. I wouldn't even want to bet that a lot of them are the same on every charge.
A lot of people tried to tell me that when we changed to LiPo it was ok, as would only need a cheap charger - there was no advantage to buying an expensive one. Well - not true!
Buying an expensive charger doens't guarentee it will be better, as I have seen it posted that some very expensive gear from a popular make isn't accurate either - but i think it does improve your chances. For example, I use a GM/Groupner UDC40 - £250 new. However it charges my LiPos arurately every time, and the cut off voltage is adjustable in the unlikely event of any issues.
That said, there are of course many examples of decent gear available at a decent price - for example, I'm sure I saw a thread of poeple commending the Core RC UAC50 on here a couple of days ago.
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Matthew White
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