Well for one, they're cheap. Secondly, if that thing is charging like that when it's not supposed to, that's taking a lot of life out of it, even if it still "works". Call it a preemptive strike. I realize "something else" is probably causing it, sure, but it's gotta be taking its toll on the coil. So since they don't break the bank, my advice it throw it in the ditch.
