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Old 04-07-2012, 02:58 PM   #1
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Default 2s Lipo Battery Voltage Drop

Hi Guys,

Im sure there are many threads about lipo batteries on here, but I can't help but feel that much of that is filled with peoples favourite brands and stuff and I was wondering if there is anybody that can give me some real comparison between batteries and advice which of the ones on the list in my link is likely to have the slowest voltage drop off over discharge. I have been measuring the ones that I have with some data logging and can see significant drop much is to be expected of most (mine are moorespeed cells)

I just hope for somebody (impartial) that can tell me if there is one particular brand that does stands out for this?

http://www.brca.org/sites/default/fi...20v1%20pdf.pdf


thanks in advance

Andy M
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Old 04-07-2012, 03:33 PM   #2
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Quote:
Originally Posted by cyclone View Post
Hi Guys,

Im sure there are many threads about lipo batteries on here, but I can't help but feel that much of that is filled with peoples favourite brands and stuff and I was wondering if there is anybody that can give me some real comparison between batteries and advice which of the ones on the list in my link is likely to have the slowest voltage drop off over discharge. I have been measuring the ones that I have with some data logging and can see significant drop much is to be expected of most (mine are moorespeed cells)

I just hope for somebody (impartial) that can tell me if there is one particular brand that does stands out for this?

http://www.brca.org/sites/default/fi...20v1%20pdf.pdf


thanks in advance

Andy M
I have done some testing using data logging equipment. The higher capacity cells have less voltage drop off over the run, as is expected. However this seems to have zero impact on performance in boosted classes. The theory says it should matter, but my data doesn't back it up. I've compared a 4200 to a 5800, both intellect cells, and the speed over the run is identical. This may be partly due to the GM esc having funky current modulation to help counter drop off... But I did do a less thorough test with the HW esc and it came out about the same.

I haven't done much comparison between brands, but my Reedy and Intellect cells of similar capacity have similar drop off.

I'm now designing a TC around the new shorty packs, since we don't seem to need these big packs that the cars are designed around, which is really a hangover from the NiMh days...
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Old 04-07-2012, 05:12 PM   #3
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mAh of a battery has nothing to do with the speed of the car, just the longevity after a full charge. So if you'd like a battery that lasts long make sure that it has a high mAh, if you want specifically more speed, ramp of the voltage to the max allowable to your motor without blowing it out, that way it starts well above normal voltage and then has to pass normal operating voltage till it can no longer operate
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Old 04-07-2012, 05:27 PM   #4
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I can't remember where on this forum it was, but people doing testing were saying that SMC and Thunder Power seemed to be amongst the best, if not the best.
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