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Turnigy Nano-tech 5C charge rate, really? - 10/4/2012 12:24 AM   
joeseif


 

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Status: offline 		I just got my new turnigy nano tech 4.5 amp 25-50C packs for an Emaxx project I am working on. On the back it sayes not to charge them over 5C. I have been charging my lipo's at 80% C since day one. Can I really charge them at 5C? is that going to shorten the life of the packs? Has anyone else tried 5C yet? I charged one at 6 amps and it did not even get warm and it charged pretty quick. I would like to charge them really fast but I cant afford to buy new ones too often.[image][/image]

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RE: Turnigy Nano-tech 5C charge rate, really? - 10/4/2012 12:28 AM   
joeseif


 

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Status: offline 		here is what I got:

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RE: Turnigy Nano-tech 5C charge rate, really? - 10/4/2012 12:28 AM   
guver


 

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Status: offline 		When I "charge like everyone else" I charge my nano tech at 13.5C and they warm up a little bit. (just about how I like them) It might shorten the life of them , and right now it only has 100 cycles or so on it. I'm confident that 5C will be no problem.

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RE: Turnigy Nano-tech 5C charge rate, really? - 10/4/2012 7:46 AM   
Goldenduff


 

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Status: online 		Why not charge at 2c and monitor temp. Then 3c, then 4 stop at 5c or before if they get warm?why not charge at 2.5c then 3 then 4c etc. stop at 5 or before if they get warm?

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RE: Turnigy Nano-tech 5C charge rate, really? - 10/4/2012 2:14 PM   
guver


 

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ORIGINAL: Goldenduff

Why not charge at 2c and monitor temp. Then 3c, then 4 stop at 5c or before if they get warm?why not charge at 2.5c then 3 then 4c etc. stop at 5 or before if they get warm?


That's a good idea. I do similar method on all packs and have a paper titled "max charge rates" then I can keep track of all of them. A couple of general observations about what one can tolerate for a "max rate"

If pack is being charged for the first time of the day or session AND is already at a storage voltage then the rate can be very high, fast. A warm pack OR one that is nearly discharge all the way needs to have a slower , lower rate. Using a higher CC/CV point requires a lower current to match the same speed/temp.

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RE: Turnigy Nano-tech 5C charge rate, really? - 10/4/2012 8:30 PM   
joeseif


 

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Status: offline 		thank you for your insight. My power supply is rated at 8 amps, does that mean that if I charge at 8amps the drawl on the power supply is 8amps?

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RE: Turnigy Nano-tech 5C charge rate, really? - 10/4/2012 9:07 PM   
guver


 

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Status: offline 		Only if the input and output voltages are equal. (give a little for waste like 10%)

In your particular case since your input voltage is around 12 volts and the output is around 8 volts then the current being pulled from the ps is always going to be around 66% of the charge current. Remember that waste though? It's probably around 70-75% of the charge current.

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