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Old Aug 05, 2006, 08:58 PM
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Charging - Pushing the limits of 1C

As most chargers my charger charges in increments of mah.. I currently charge my 1900mah battery at 1700mah, charges cool as a cucumber. Would I damage the battery if i charge at 2000mah? and if so, is temperature the best indicator of whether it is too much?

Interested to know how far people push the envelope above 1C...
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Old Aug 05, 2006, 09:20 PM
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Standard disclaimer: Charging at greater than 1C should only be with cells / batteries so approved by the manufacture.

There are many of us charging at 2 and 3C however we are using balancers and taking extra precautions.

This single cell test was conducted to see what effect 2C charging and 12C discharging would have on cell life.

http://www.rcgroups.com/forums/showt...70#post5360770

Post here has results of charging at different rates with TP-1010C / 210V combo and links to additional charge logs.

http://www.rcgroups.com/forums/showp...06&postcount=2

The newer generation high C cells rated 13-20C are more tolerant of high charge rates than the older cells were. There are cells approved for 3C charge rates when approved charging equipment is being used.

Charles
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Old Aug 05, 2006, 10:46 PM
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reading here are my takeaways for high discharge batteries:

- know thy batteries, each will behave differently

- Diminishing returns after 1.5C: The greatest charging time reduction is from 1 to 1.5, after that charging time is cut but each .5 has less and less impact

- the above is also true for reaching full capacity

- no impact on battery life, if balancing is done routinely

- and obviously great care and caution must be exercised, as always with Lipo


thanks.
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Old Aug 06, 2006, 07:22 AM
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Quote:
Diminishing returns after 1.5C: The greatest charging time reduction is from 1 to 1.5, after that charging time is cut but each .5 has less and less impact
True in general but in many cases the charger in use plays a major role in determining the actual charge time difference.

A Triton charges almost as slowly at 2C as it does at 1C but a TP-1010C is fairly close to being linear.

Charles
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Old Aug 06, 2006, 10:12 AM
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I can super fast charge my TP Prolites or any LIPO pack with balance connector at 3C, for eaxample a 2100 mah at 6 amps using the AF 109 with tp 205 balancer , ready to fly in less than 1/2 hour, all cells read exactly 4.18 v each and there is no heat on the packs, only on the balancer as it bleeds off the excess current at 420 ma max to match up all 3 cells

As long as U can keep the voltage pressure of each cell ~ 4.2V , U R safe
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Old Aug 06, 2006, 10:53 AM
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i'll do some tresting with me apache 2500. max charge is 2.5 amps and most of my batteries are in the 1500-2000mah... so i dont anticipate going over 1.5

Thanks again!
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