They have been vintage for about a decade now.Gavin Scooter "Preservation" Society..... that cant be a good sign. When are they officially Vintage?
I've thought about doing the lithium pack in one of mine. I'm still weighing the cost, its pretty pricey.
The problem with a lithium pack is:
1) the brush board can't tolerate long runs of an hour+ so a huge pack isnt worth making
2) the tube is so giant you need a heavy battery or you need lead. You can cut down the long or magnum tubes to a short and still have tons of runtime - but you still have a really heavy scooter.