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Thanks for the excellent summary, caver01...
I am looking into this mod myself, since my searches have proved that it's probably the easiest for improved speed (as compared to a PCB swap, and also less expensive).
I saw alot of posts from some of the EE gurus here though, about charging trobles (Axel and someone else). Those threads were related to the fact (I think) that since the batteries are in series, when you charge them up, the current is going through the first battery, and then into the second, so that the charge was really only getting to the first battery in the series.
With that said, does increasing the voltage (i.e. 3rd battery in series on the controller) for the charge actually stop this issue? Or are you really charging up the first battery to 100%, and then the charge is getting through to the second battery. Or is the increase in voltage without the increase in resistance actually pushing the current through to both batteries at the same time.
Apologize to anyone if I'm repeating other posts, but my exhaustive search about this never really answered that technical question.
As an aside, can I assume that if I do a dual battery mod, and also increase the voltage x2 in the controller, that the timing constant being used by the controller to time the charge would effectively increase by 2, thus giving same running times between 1 battery 3.0 V and 2 battery 6.0 V?
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