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So the two batteries I wire together in series should stay together? like label them Bat1, Bat2, Bat3 & Bat4 and keep Bat 1 & 2 together and 3&4 etc?
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Is this so that they are on the charges same amount of time?



It's all about making it easy for you to avoid putting a fully charged pack in series with a discharged pack. By keeping the banks distinct and charging each pack at exactly the same time you end up with the situation where that this is _never_ going to happen. Each pack in the bank will be either fully charged or at a similar level of discharge. You're never going to find yourself with one known charged pack and wondering whether you remembered to charge the other, or with on charged pack and wondering which of the other 3 packs is its charged sibling.

It's by no means necessary to do this. You could charge each pack in turn.

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I have a RC Charger that charges at 1/2/4 amp...


It sounds like this is ideal. It would be useful to know the make/model before I put my neck on the block though. As long as it is a voltage peak cutoff charger and not a timed charger then it should be good.
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