Going spare is my original AB battery set which I've replaced with a set of high capacity v-locks.
The batteries are set of 4 x Anton Bauer ProPac 14.4v 65Wh batteries that were re-celled before I got them last year. They have not had a huge amount of use since I got them as I have been mostly using lighter batteries. They seem to keep their charge fine but I've mainly been using them to power the monitor so not exactly been stressed! They are pretty heavy so have been useful for balancing heavier cameras.
The charger is a Logic Series Lifesaver Magnum.
Its all fairly battered cosmetically but seems to work fine!
Based in the UK, asking for £100 OBO.