whatever is legal this year should also be legal next year, plus any new packs. The only time cells have come off the list was for the old IB4200 NiMH cells when they started to get unstable
The Demon saddles were excellent value, but anything with a C rating of 25 or more should be fine for 4wd. If you run on a particularly slippy track then a lower C rating should be fine, but in that case you should probably be running a lower motor than a 5.5!
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