Anyone know if the below is correct for a homebuild li-ion. It seems a very high amp rating.
First, we find the average resistance per cell:
An internal resistance of just 8.54 mΩ per cell is excellent for a 5500mAh pack. Using this correct value, we get these performance figures:
Thanks
You better use the cell manufacturer specs - resistance likely varies quite a lot in use
The latest P50’s (standard 21700 size) are given as 50Ah with a 75A max discharge for example
Purchased a 6s 6000mah lipo as it has a bit more grunt. The 2 x 5500mah 5s li-ion i made are doing around 18 mins each. The lipo 6s did 20 mins today with a bit left over.
I think a good tune will make it better and possibly 3000mah lighter battery for a bit more fun as 20mins felt like forever
What is the weight of your liion packs? Usually you can carry lot more Ah using Liion (2 of my 5000mAh 6S Liion weighs nearly the same as a single 6000mAh Lipo for example.
My 6S 6000 lipo weighs 650 and the 5s 5500 weighs 520
I did double up the 5s to a 11000mah but it was huge and lasted to long. I decided the feel of the drone was better with the 520g instead of 1040g load. Tbh i was shocked how easily it lifted 1040g
I think the liion are heavy due to using smaller cells but i was given 2 new drill batteries for free and thought what the hell ill strip them. It was more an experiment than a long term power solution.
I was going to buy some proper liion packs but couldn’t find many in the uk.
As you can tell im a bit of a tinkerer but i think that comes from years in I.T and Engineer. For me everyday is a school day and i love to drain people of information. 
Cheers for all the advice