Hi Julian,
I'm not fimilar with the Trinity keyboard.
I have a Yamaha. But they put tho's small battries in keyboards to hold the programed memory you have in your board, when you unplug it from the power. I've heard the batt. in the yamaha should last about 5 yrs. that could be wrong. In the Yamaha its soldered in. They recommend you take in to the shop.
But then again I don't know how yours is installed! I hope I've helped a little.
Seasons Greetings
![](http://www.synthworld.com/ubbs/wink.gif)
Nobby
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[This message has been edited by Nobby (edited 12-28-2000).]