@kelbot The Motorola DLR & DTR have an internal Li-Ion battery that is easy to swap (there's a battery cover on the back). https://www.motorolasolutions.com/content/dam/msi/docs/en-xl/mot_dlr_spec_sheet_en.pdf probably gives you everything you need to know about that. Note that batteries from units you get off eBay, as with any other li-ion thing you get used, may be in various stages of health... but it would take a VERY unhealthy battery to take something that would normally last 14 hours and make it only last, say, 2. 1/