Personally I'd stick with the older NiMh packs, purely because they are cheaper, easier to look after and the older Tamiya's were never designed to run continually. Something that will be a problem for that TL-01 based buggy with the limited gearing and over sized wheels.
And that disassembled nitro above, looks to be the on road version of the Gv buggy I've got, Probably a Gv/Great Vigour P190. Spares of witch, as they are getting on for nearly two decades old are next to impossible to find. I'd love to get the 2 speed working in mine again (converted it to single gearing) But the shaft I wore out in mine are just not available.