I sell the batteries pre-made (check link in my signature), as well as I have links to the instructions in there (and there is a pretty good instruction on reddit too). Price is $40 USD + shipping for the packs pre-made (wire harness installed, shrink-wrapped etc.) I use the VTC6 cell as it was the best one I found when trying different options. If you want to make your own, by all means, you can either remove the wire harness from the existing battery pack and solder it to a new one, or I could send you the specs on the wire and connectors (I use a silver plated wire to conduct sufficient current at the size they require to fit ... you can't just use any wire as your typical wire rated for the current it is pulling is too thick to work with the connectors). For the batteries, you either need to buy them with u-tabs pre-welded on, or you can purchase or build your own spot welder and install your own tabs. You can't solder directly to the batteries ... even soldering to the tabs it's important you use heat sink clamps to ensure the heat doesn't make it to the battery terminals.Hey mate my crafty was red/yellow dead according to S&B only a new one was the solution .... i replaced the thermal fuse and it came back to life, how i miss this guy... i wanted to replace the battery and by the way @rebis describes a sony VTC6 (i have 2 for the IQ) are a good option, can you please send some photo info on how to do it, replacing the fuse was easy but soldering is a different game...