Granite Arrma kraton 4s battery discharge ?

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ROBERTLONDON

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Hi guys. I have kraton 4s and I run 2x 2s 6500mah 110C GNB
My kraton seems to be discharging both batteries down to 3.80 per cell instead of 3.20 before it cuts off. I know that after cut off point the battery will bounce back up to 3.40 or something when some time will pass before you get back home etc. But 3.80 is no way OK. What is the cause of it please?
 
These are the 2 most likely problems.
  • You are getting massive vdroop on the batteries kicking in LVC. Basically under load the voltage of the lipo dips below 3.2v and sets off LVC but once the load is removed the voltage recovers back to normal. Remember always take the listed C rate on a lipo battery pack with a grain of salt as it is physically impossible for a lithium polymer battery to have a true C rate higher than ~50c. There is not a lipo battery on the planet that lists the true C rate of the pack, 99.9% of the lipos on the market that list a C rate above 100c are usually much closer to 25-30C. That being said a lipo with a low true C rate will have more vdroop than one with a higher true C rate. If this is indeed what is happening your batteries might only have a true C rate of around 20-25C.
  • LVC on the esc was set incorrectly from the factory, there was a batch of the BLX100 escs that had this problem about a year ago or so.
How hot are the batteries after a run? This will be a clear indicator if the problem is the batteries or not.


There is a lot to read in these links but it does help put things into perspective when batteries do not perform as well as you think they should.
https://www.arrmaforum.com/threads/c-rates-what-is-the-deal.17174/

https://www.rcgroups.com/forums/showthread.php?1767093-Battery-Load-Test-Comparisons
 
These are the 2 most likely problems.
  • You are getting massive vdroop on the batteries kicking in LVC. Basically under load the voltage of the lipo dips below 3.2v and sets off LVC but once the load is removed the voltage recovers back to normal. Remember always take the listed C rate on a lipo battery pack with a grain of salt as it is physically impossible for a lithium polymer battery to have a true C rate higher than ~50c. There is not a lipo battery on the planet that lists the true C rate of the pack, 99.9% of the lipos on the market that list a C rate above 100c are usually much closer to 25-30C. That being said a lipo with a low true C rate will have more vdroop than one with a higher true C rate. If this is indeed what is happening your batteries might only have a true C rate of around 20-25C.
  • LVC on the esc was set incorrectly from the factory, there was a batch of the BLX100 escs that had this problem about a year ago or so.
How hot are the batteries after a run? This will be a clear indicator if the problem is the batteries or not.


There is a lot to read in these links but it does help put things into perspective when batteries do not perform as well as you think they should.
https://www.arrmaforum.com/threads/c-rates-what-is-the-deal.17174/

https://www.rcgroups.com/forums/showthread.php?1767093-Battery-Load-Test-Comparisons

These are the 2 most likely problems.
  • You are getting massive vdroop on the batteries kicking in LVC. Basically under load the voltage of the lipo dips below 3.2v and sets off LVC but once the load is removed the voltage recovers back to normal. Remember always take the listed C rate on a lipo battery pack with a grain of salt as it is physically impossible for a lithium polymer battery to have a true C rate higher than ~50c. There is not a lipo battery on the planet that lists the true C rate of the pack, 99.9% of the lipos on the market that list a C rate above 100c are usually much closer to 25-30C. That being said a lipo with a low true C rate will have more vdroop than one with a higher true C rate. If this is indeed what is happening your batteries might only have a true C rate of around 20-25C.
  • LVC on the esc was set incorrectly from the factory, there was a batch of the BLX100 escs that had this problem about a year ago or so.
How hot are the batteries after a run? This will be a clear indicator if the problem is the batteries or not.


There is a lot to read in these links but it does help put things into perspective when batteries do not perform as well as you think they should.
https://www.arrmaforum.com/threads/c-rates-what-is-the-deal.17174/

https://www.rcgroups.com/forums/showthread.php?1767093-Battery-Load-Test-Comparisons
Hi. The batteries are never hot and my esc has orange plugs not blue like pics on the box. It's a problem to buy good battery. Most of them have small mAh as well as plug is not EC5. So getting soldering kit and do all that is pointless
 
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