Used but not abused collar in excellent condition. Great unit. http://www.dogtrastore.com/2500tb.html#.V_LN8PkrLIU
Collar is 6 years old. It was used little for the first few years but probably has 30 days/year for the past 2 seasons. It is charged after every day of use and monthly during the off season. It charges quickly and I've never run out of juice- even while hunting a full day in below zero temps. Never a problem with it. I recently acquired a 2nd pup so I need to upgrade to the 2502 2 dog system. Collar retails for $350 (see link above for more info), will sell for $200.