You're quite welcome.
I have been looking for an EXACT battery replacement, but have only found a more "generic DEZL series" battery listed. Here is an example of the search results from Amazon.
Garmin dezl battery (search results)
But I noticed that almost all of those listing mention the smaller 560 model - which is similar to the Nuvi line of devices.
These batteries MAY "fit", but will most likely have a lower capacity than your internal battery. But if you keep it plugged in most of the time, that really shouldn't too much.
If it was ME, I would try to find a local "battery store", and see if they have (or can get) a better matched battery for you, and at the same time do the actual replacement of the battery (many battery stores do that).
A new battery will also need to be charged up for a couple hours (at least), so be prepared to do that.
Please let me know how the long charge cycle goes, or if you have any more questions.
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Thanks, ***** *****