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Testing my Li-Ion Drone Battery vs. Li-Po
111 12 8-2 05:47
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QuadcopterGuide
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Hey all,

I recently built my own Li-Ion battery pack and in this weeks video I test it head-to-head against a Li-Po pack. Check out the video:


Looking forward to your comments here and on YT.
8-2 05:47
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mc54
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A hover test is not a good way to compare these two types of batteries. Nobody flies like that in the real world.
8-2 07:37
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A J
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Thanks for sharing
8-3 00:31
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bjr981s
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Discharge rate is not the main issue comparing LiOn and LiPo. The LiPo has a greater power storage than LiOn per Kg. To do this comparison you need to compare batteries of the same weight.
8-3 00:36
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QuadcopterGuide
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mc54 Posted at 8-2 07:37
A hover test is not a good way to compare these two types of batteries. Nobody flies like that in the real world.

hey mc, while i agree that the battery needs to be able to provide more power than just a hover, to do a half way fair comparison in flight-time I thought the hover test was fine.

Further testing required, but signs look positive for the li-ion battery.
8-3 03:19
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QuadcopterGuide
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A J Posted at 8-3 00:31
Thanks for sharing

hey AJ thanks for watching
8-3 03:19
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A J
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QuadcopterGuide Posted at 8-3 03:19
hey AJ thanks for watching

You're welcome
8-3 03:26
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QuadcopterGuide
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bjr981s Posted at 8-3 00:36
Discharge rate is not the main issue comparing LiOn and LiPo. The LiPo has a greater power storage than LiOn per Kg. To do this comparison you need to compare batteries of the same weight.

hey bjr,

i actually found the opposite is true. In my specific case here are the numbers:

LiPo pack 180grams per 1000mAh
LiIon pack 104grams per 1000mAh

this is why many fpv flyers that want longer flight times build li-ion packs.
8-3 03:53
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DJI Stephen
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Hello there Felix. Thank you for reaching out and for posting this video on how your build your own Li-Ion battery pack for your DJI FPV. Again thank you for your valued support and fly safe always.
8-3 20:09
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bjr981s
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QuadcopterGuide Posted at 8-3 03:53
hey bjr,

i actually found the opposite is true. In my specific case here are the numbers:

You are comparing Mandarins with Bananas.

As I said the difference is the Storage Power in the comparison. Not a MAh rating without a C rating.

The Measurement is in Watt hours not MilliAmp Hours.

Power in hours. Not current in hours.

And your hover flight is completely not relevant. You need to stress the amp delivery.

You will find your 1,000 mah hour battery will supply way less than 1,000 mah once you up the current demand.

I have recently tested the HobbyKing 3.0 20C 2S (2S2P) nanotech rx battery and advised HobbyKing of their mislabeling. I was going to use these in my Twin Scale SU35S turbine so tested their specific capability before I put them in my $30K jet.

It's actually a 2C battery. At 10C half its C rating it delivers 300mah before the battery brownouts and collapses. 1/10th of its stated capacity.

You need an actual battery discharger analyser to do your tests. The way you test is anecdotal at best.

Cheers

p.s. Forgot to add. LiOn batteries are a lower Voltage than LiPo batteries. So what Voltage is your 2 theoretical batteries you quoted?
Im not trying to be antogonistic, really. Its just you have the bull gripped firmly by the foot.

If you want to do a proper comparison you actually need to use the correct factors in play.  
  
8-6 07:09
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QuadcopterGuide
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bjr981s Posted at 8-6 07:09
You are comparing Mandarins with Bananas.

As I said the difference is the Storage Power in the comparison. Not a MAh rating without a C rating.

sure, Watt hours. Not 100% sure how the lower working voltage of li-ion does there. Of course flying with Li-Ion is going to be different than LiPo. I plan to fly differently with both.

I just got an over 14min flight in super gusty conditions flying at 45-55km/h. Not shabby.
8-8 10:14
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QuadcopterGuide
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DJI Stephen Posted at 8-3 20:09
Hello there Felix. Thank you for reaching out and for posting this video on how your build your own Li-Ion battery pack for your DJI FPV. Again thank you for your valued support and fly safe always.

No worries thanks for checking it out Stephen.
8-8 10:14
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bjr981s
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QuadcopterGuide Posted at 8-8 10:14
sure, Watt hours. Not 100% sure how the lower working voltage of li-ion does there. Of course flying with Li-Ion is going to be different than LiPo. I plan to fly differently with both.

I just got an over 14min flight in super gusty conditions flying at 45-55km/h. Not shabby.

The motors have a KV. That is the number of revs per volt. A lower voltage means that you have to apply more relative throttle to get the same revs. And the same lift from the props.

The esc and props consume power. P =VI

If the Power is the same to power the drive train then as V is Lower I must be higher so your comparison mAH hours is wrong.

You need more mah in a LiOn battery to do the same work as a LiPo.

I like that you are doing this comparison it should be done.

The mini uses LiOn batteries and a lot of people get confused as they have completely different characteristics to LiPos.

Good luck with your comparisons If you need someone to double check your assumptions I am happy the help.

p.s. LiOn batteries are way more easy to maintain than LiPOs and the LiHVs that DJI use.

Cheers Brian



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