Yes to both questions. Some, like the 2610/2650 does not have batteries. Instead they use a 12/24 volt external power source or 120 converter.
Others like the Zumo series and some of the GPSMAP units have propriarity batteries.
It's not the problem you may think it is, other than the units that don't run on battery power [when I say battery power, I mean the units do not have a battery installed] to take with you when you walk - you just take the power adapter with you. No biggie unless you want to use it on foot.



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