Hello,  I hope everyone had a Great Christmas and Santa was good to you. I have an old Minelab GPX 5000 from 2014. I tried firing it up and of course the rechargeable batteries are as dead as a doornail. There are three (I think they are lithium) batteries that are about 2.625" long by .720" diameter. I don't want to spend the enormous money of getting a new battery pack or having Minelab replace them. I have spent most of my life as an Electronic Technician so this would be a simple repla