1 battery vs 2 batteries that equal the same mah?

General Drone Discussions
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I have a question about batteries, seeking real-world experiences rather than theoretical math.

I am considering using a single 10,000mAh 4S battery instead of two 5,000mAh 4S batteries to extend flight time for my 690mm photography rig. Both setups would have the same or similar C rating.

Here is the comparison:

  • Two 5,000mAh 4S (25C) batteries: 125 max amp draw, 10,000mAh, ~1300g
  • One 10,000mAh 4S (25C) battery: 250 max amp draw, 10,000mAh, ~800-850g

I need about 115 max amps, so both setups work in theory.

My main question is about flight time and voltage sag. Will the lighter, single 10,000mAh battery provide more flight time due to weight savings, or will it experience voltage drop-off sooner compared to two 5,000mAh batteries?

In other words, do two batteries maintain voltage better than one larger battery in the same flight conditions?

I am looking forward to hearing your experiences.

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One battery is better because it costs less and charges faster. This is true for some cases, but it’s not what I was looking for.

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  1. I use just one battery because it’s easier to keep track of its performance throughout its life. The aircraft was designed to work best with a single battery pack, which helps improve efficiency and flight times.

  2. The flight time you’re seeing is typical for a hexacopter of that weight. There are many factors that can affect it, so it’s hard to give more details without knowing more about your specific setup.

  3. Your failsafe setting seems about right. The minimum safe voltage is 3V per cell, but the voltage drops quickly between 3.7V and 3.3V, so it’s best to avoid going below that. For a good explanation, check out Brad Hughey’s post in the thread below.