What do LiPo ratings mean? Deep dive on our FPV LiPo packs with dirty science // BaconNinjaFPV

[@zlachannel8674]

good science

[@sunsetpark_fpv]

@ 15:34 - thank you for that breakdown of information MBN! I'm so glad that you did a deep dive into Lipo's 😎 So - heres what happened to me - Last year, during the fall season, I had my Lipo's all juiced up but didn't fly them. I would literally get in my bed, look towards my feet and realize - "oh shit, my flight bag," and then think to myself "oh fuck my batteries are still charged". So it was weeks later that I finally decided to storage charge my batteries - fast forward to this spring season - my battery voltages plummet and die VERY FAST - and I finally realized that its the INTERNAL RESISTANCE of the cells that are compromised.... and so I am on a mission to match IR and salvage whatever packs that I can..... Thanks again for all the helpful info on this Lipo deep dive! 😎

[@BaconNinjaFPV]

Man, idk how many times i have had to change plans and left charge lipos longer than i would like. I am usually pretty OCD about battery care though, so never more than a couple of days then they are flown and promptly put back to storage. Time above or below that nominal voltage I talked about will for sure degrade the reactants in the battery and makes them a little less efficient every time. Love you lipos, and they will love you back! Lol

[@sunsetpark_fpv]

@@BaconNinjaFPV thanks also for reading and replying! Appreciate you bro!

[@BaconNinjaFPV]

If you take the time to write it, it's only right thay i take the time to read it! I am always gonna do my best to give what i get.

[@kszyh_]

Everyone talks about internal resistance - that it should be similar for every cell. What do you mean "it can't be significantly different"? 5%, 10%, 20%, 100% different than others? Is 11 mOhm compared to 5 or 7 already too much?

[@BaconNinjaFPV]

Unfortunately there aren't really hard and fast rules about variations in IR between cells. Personally, if one cell is reading double the IR of the next highest cell in the pack I start to get concerned. Once I am suspicious of a pack with that going on, I will start to pay more attention to how warm it is getting after a flight and what the landing voltage is of that cell compared to the others. If the pack is getting more warm than I would like, or the voltage of that cell is not within 20% of the others when I bring it back from the field, it is marked for retirement. It is also important that all of the cells in your pack are around the same voltage when you check the IR as it can throw off readings a bit if they are out of balance. I always suggest reading it at full charge after balancing as this will give you the lowest readings each cell can achieve.

[@kszyh_]

@@BaconNinjaFPV Thanks for clarification

[@BaconNinjaFPV]

any time!