Martin,
The most important thing is to recharge your battery using a smart external charger for at least 24 hours, preferably more, if you want it to give a good, long life.
Regarding the cause of this, it would be a bit of a coincidence wouldn't it, that your battery decided to die immediately after you had trouble switching off your Navall. There's one easy way to find out. Remove the fuse or otherwise disconnect the power supply to the Navall and see what happens.
Simon
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"Whatever is rightly done, however humble, is noble."
Sir Henry Royce.
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