The Optimate is designed to be left on the battery for long periods. After giving a full charge, it goes into a test mode. It stops charging for a while, and then checks to see if the voltage from, the battery has dropped. If volts have fallen below a certain level (i.e. the battery isn't holding its charge properly) it will report a faulty battery. Otherwise it just delivers a float charge and keeps checking itself.
I use my bikes too much to know if it works over very long periods, but I have friends who park the bike in October, plug in the Optimate, and dig it all out again in April. None have ever cooked a battery that way to my knowledge.
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