Plz consider a whole new rebalancing of Jetpacks.
Current idea is for the current Electric Jetpack to be rebalanced to have extreme power consumption (about 15-30 secs of flight time to 30000 EU full charge). Fuel Jetpacks are left alone (possibly buffed in flight time). To fill the need for more useful Jetpacks but balance resource management, there should be more expensive, higher tier jetpacks (Advanced Jetpack) requiring more power to function. There can also be an "Armored Jetpack", with a static armor value like Iron or Bronze armor, but jetpack capability similar to a basic jetpack.