http://www8.garmin.com/support/outofwarranty.html
garmin will do it for 89$
Prices include complete factory overhaul to new required specifications and domestic ground shipment back to you.
John sending them back to garmin was reasonable, for refurbished collar but as of today when I sent two collars back they have gone up 30% so my S.S. is keeping up with the cost.I am giving a lot of thought to going to another tracking system when I get them back,at least you can get some of the hunters that work on other systems. good luck