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Is your model a StreetPilot? if so, it's a 56LM not a 65LM (which would be a Garmin Nuvi, a larger screen-size device for sure.)
How old is the Garmin device ?
If it is longer than a year since you bought the Garmin device you are asking about, then it would be out of warranty coverage, regrettably.
A Zumo 665LM... if older than a bit over a year, it is likely that the battery in it has failed. Rechargeable batteries do fail eventually.
Would you like to try replacing the battery yourself? or would you prefer to send it to Garmin Repair and have them do the work?