How do I fix it so it will take a charge again

I have 3 makita 18 volt batteries that will not accept a charge anymore, they are "bricked" as I've been told.

Is there a way of fixing this so I can still use them short of rebuilding them with aftermarket parts?

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There is no easy way to fix them so the charger will accept them again, there is a PCB inside with a control chip that tells the charger if the battery is somehow under-volted and it stays that way even after a manual recharge of the individual cells.

One way is to use an RC-charger with low current directly on the battery poles.

Another way is to change the PCB, like this:, there is a number to an ebay item in comments.

I have even seen a guy who soldered all the components off the PCB and hooked the cells to the yellow connector, and them modified a charger so he could do balancing with an RC-charger.

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