I am making a drone for geological applications and for that we require a flight time of 1.5 hr without payload. Could anyone recommend any battery types of alternate power sources that I could use?
closed as off-topic by Chris Stratton, DoxyLover, RoyC, Harry Svensson, Finbarr Mar 13 '18 at 10:37
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Most commercial, lipo powered multi-copters top out around 27 minutes.
There are some demos online of flight times as long as 2 hours, but they appear to be extremely minimalist and totally custom builds. Basically just a giant battery, huge props, and a bit of carbon fiber to hold it together.
A fixed wing, aka a plane will easily be able to achieve these kinds of flight times.
RC helicopters may be able to do it. And they give you more power options (aka combustion engines). But I looked briefly, and the hobby grade gear seems to have similar endurance to multi-copters, so probably not a great option unless you're looking to engineer the whole thing from scratch to maximize flight time.