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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?

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closed as off-topic by Chris Stratton, DoxyLover, RoyC, Harry Svensson, Finbarr Mar 13 '18 at 10:37

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  • \$\begingroup\$ In addition to being formally off topic here, this is the type of question you should pursue on a drone forum where there is practical experience of the subject matter. \$\endgroup\$ – Chris Stratton Mar 10 '18 at 6:56
  • \$\begingroup\$ 1.5 hours is called C.66 (the rate of drain.) Just about EVERY LiPo these days can handle at least C25 drain rates. So there is NO problem on that aspect. All LiPo will work at your drain rate. The problem is working out what your total mass that must be lifted is and how that is going to be achieved. Once you know that, which includes the current and voltage, you just multiple the mean current by the mean voltage by the 1.5 hours and you get Watt-Hours out of it. That will tell you how much LiPo you need (how many cells and how they are staged up.) You will be using LiPo. That's a given. \$\endgroup\$ – jonk Mar 10 '18 at 6:58
  • \$\begingroup\$ new battery type (graphene) \$\endgroup\$ – Tony Stewart Sunnyskyguy EE75 Mar 10 '18 at 8:00
  • \$\begingroup\$ best bet uavfactory.com/page/research-education \$\endgroup\$ – Tony Stewart Sunnyskyguy EE75 Mar 10 '18 at 8:36
  • \$\begingroup\$ and internal combustion motor may work \$\endgroup\$ – jsotola Mar 10 '18 at 8:41
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Most commercial, lipo powered multi-copters top out around 27 minutes.

http://www.dronesglobe.com/guide/long-flight-time/

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.

https://www.youtube.com/watch?v=EF4YeUC2PXA

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.

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