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P1449 has several subcodes you need to find out which it is.
You need to get the equipment detailed in that thread on IC and test your sticks.
You could have a few dud sticks (if you are lucky) or you might find that the IR of all your sticks has increased and they can simply not cope with high IMA currents anymore, in which case all would need replacing. Nothing you can do about high IR.
If you confirm high IR on all sticks then you could consider my IMAC&C device for the HCH1 which has a battery protect mode stopping or reducing the ima requests to levels the battery can cope with. It's well documented on IC.
The best option would be to fix the pack of course.
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