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Re: On Board Fire Extinguisher
Kidde are arguably as good or bad as any other. American LaFrance and some other companies produce similar but I've never heard of any of them being called "better" than the others. They're pretty much commodities.
As MarkSF said, let Kidde send you new ones to keep the USCG happy, and pursue other options to do the real extinguishing.
What people don't realize is that the standard "liter soda bottle" size extinguishers really can't put out more than one burning skillet or one office desk trash can that's on fire. And that a fire (residential and office fires, anyway) doubles in size every 30 seconds, so you've got a minute or so to respond and then that little extinguisher isn't going to do the job. But, it keeps the USCG happy.
Dry powder, real foam, CO2, some of the new chemicals, all have their best uses and all are useless in other types, so it pays to read up and take several types. CO2 certainly means the least cleanup in an engine bay, plus choking off the engine.