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well... either we are talking past each other.... you keep talking about a parallel charging board, that is a serial charging "board". Or there is some communication issue.It still does not balance charge as the original poster was asking about, when hooked into parallel you cannot balance a 1S battery it is either charged or some where in between. You could use this with his particular charger MAY be able to put the 1S batteries into storage charge With my charge I can set the percentage of charge I want which in essence can do storage charge of 1S cells. But they will not be balanced as I stated earlier you cannot balance a 1S battery as there is only one cell, so what would you balance it against?.
Either way, what I am looking for doesn't seem to exist currently and unless the charger does balanced storage, there isn't a way to trick it to work using a series board and a parallel board has issues if you connect batteries that are significantly different in charge levels.
Maybe I need to look up the circuit designs for this and see if I can come up with something that can do both (storage and charge) for these batteries.
That said I have seen this: https://www.tinywhoop.com/collections/batteries/products/tiny-whoop-1s-discharger-pw-jst2-0-battery but was looking for a charger that does that and charges the cells and has multiple ports.
maybe the solution is just a few of those... charge, then run on that until at storage. but it would be more useful to just have a charger that you can switch between storage and charge and it will automatically get the battery to the correct voltage.