[NSRCA-dist8] [External] Re: Batteries

Wed Jan 26 10:00:13 AKST 2022

OK, so, does it make a difference if I get the 35 C 10s 5000s versus the 25 C 10s 5000s?

From: NSRCA-dist8 <nsrca-dist8-bounces at lists.nsrca.org> On Behalf Of Patrick Harris via NSRCA-dist8
Sent: Wednesday, January 26, 2022 11:18 AM
To: Jim Hiller <jnhiller at comcast.net>; AK, ID, MT, OR, WA, WY <nsrca-dist8 at lists.nsrca.org>
Subject: [External] Re: [NSRCA-dist8] Batteries

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Jim, Art,

My pleasure. It's interesting to note that Andrew and AC will not be able to utilize the longer flight times of 12's at the NATS and the Worlds.

As an aside, there was an interesting (or contentious) thread on RC Universe a while back. The guy wanted to get in a fight with me, but I wanted nothing to do with it. He was off on some tangent that a 12's system will not result in lower heat in the batteries. The long and short of it is, a 12's system is a higher voltage system than 10's, which results in it (12's) being a "more efficient" system. I am no electronic genius by any means, but I do know that higher voltage systems are noted as being more efficient. For our purposes, an efficient system simply has a lower current draw, which results in lower heat being generated within the system.

John can correct me if I am wrong, but it's pretty much a question of how we generate the "Watts" in our system. In a 10's system, to generate X amount of watts of power, we need to pull X amount of Amps from the batteries. In a 12's system we now trade volts for amps. Simply said, to now generate the same amount of watts as our 10's system, we now are able to pull less amps from the batteries. (40 volts times 70 amp draw equals 2,800 watts) Conversely in a 12's system, (2,800 watts divided by 48 volts equals a 58 amp draw). Amps times Volts = Watts

The bottom line is the roughly 12 amp less draw is really pretty irrelevant for our motor and ESC. Yes they might run a bit cooler, but they are built to take it. The real bonus is with less amp draw from our batteries they are simply going to run cooler. As we all know, heat is the death knell to our batteries. Less current draw equates to less heat, which equates to longer battery life. A high current draw from our batteries raises the internal resistance. The next time we fly, our batteries heat goes up due to the higher internal resistance, which now raises the internal resistance even further, which results in more heat being generated....the result a big puffy, shot battery.

There is also a side note that I am not versed enough to discuss. It's my understanding that a higher voltage system may have less internal resistance of its components due to the lower current (amp) draw. Lower internal resistance equates to lower heat generation.

It's all about the heat baby! Keep in mind, your mileage may vary.

On Wed, Jan 26, 2022 at 10:31 AM Jim Hiller via NSRCA-dist8 <nsrca-dist8 at lists.nsrca.org<mailto:nsrca-dist8 at lists.nsrca.org>> wrote:
Scott, I’m no expert but I don’t think I’d do that, epically if batteries are not purchased together and USED together. If one of the four gets week it will drop voltage faster then the other three and increase amp draw. If one is not paying close attention to the battery condition excessive amp draw will detiourate the other three, requiring replacement of all four. I’ve had this happen with a low voltage shutdown to two 5-S batteries, running the good one as well. To prevent this the ESC low V cut off would need to be set too high.

This is just my opinion.
Jim

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From: Shawn Bekheimer via NSRCA-dist8<mailto:nsrca-dist8 at lists.nsrca.org>
Sent: Wednesday, January 26, 2022 6:06 AM
To: stnagler at gmail.com<mailto:stnagler at gmail.com>; AK, ID, MT, OR, WA, WY<mailto:nsrca-dist8 at lists.nsrca.org>
Subject: Re: [NSRCA-dist8] Batteries

I can’t see why not. There will be minimal loss due to connector count but most likely not noticeable.
Sent from my iPhone

On Jan 25, 2022, at 11:14 PM, stnagler--- via NSRCA-dist8 <nsrca-dist8 at lists.nsrca.org<mailto:nsrca-dist8 at lists.nsrca.org>> wrote:

Maybe a newb question, but could 4-3s batteries work as well to get to 12s?

Scott

On Tue, Jan 25, 2022, 20:57 Patrick Harris via NSRCA-dist8 <nsrca-dist8 at lists.nsrca.org<mailto:nsrca-dist8 at lists.nsrca.org>> wrote:

If you haven’t seen it’s, here is the video Andrew did recently comparing 10’s and 12’s

https://m.youtube.com/watch?fbclid=IwAR1ylyggiK9aZWt0I2eG19TTULyKflWRfKcCg2P510HLmvHZw8bVTwSq6t0&v=0Rz5WdhEJwA&feature=youtu.be<https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fm.youtube.com%2Fwatch%3Ffbclid%3DIwAR1ylyggiK9aZWt0I2eG19TTULyKflWRfKcCg2P510HLmvHZw8bVTwSq6t0%26v%3D0Rz5WdhEJwA%26feature%3Dyoutu.be&data=04%7C01%7CKarl.Watts%40saintalphonsus.org%7C5016d96051a14afcad4408d9e0f84cc2%7C0d91e6194a2c4c80b9598fdf518e52e8%7C0%7C0%7C637788179752285289%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C2000&sdata=iyiN5VLULnwsrw1AYQaUiBEH00%2BlBKErwNDWCAtXOfg%3D&reserved=0>
Sent from my iPhone

On Jan 25, 2022, at 7:32 PM, Sean Mersh via NSRCA-dist8 <nsrca-dist8 at lists.nsrca.org<mailto:nsrca-dist8 at lists.nsrca.org>> wrote:

I have experimented with 12S batteries; I used the TP 4000mAh batteries. Average remaining capacity after one P-23 flight: 38%.
With 10S TP 4400 mAh batteries: Average remaining capacity after one P-23 flight: 32%. It is the same for the newer version that is 48 g lighter, almost 2 ounces 🙂!
Weight:
TP 12S 4000 mAh, 25C ProLiteX: 1062 g
TP 10S 4400 mAh, 25C ProLiteX: 1025 g
New TP 10S 4400 mAh, 25C ProLiteX: 977 g
My conclusion: unless you're flying F-23 and Unknowns, 10S 4400 mAh batteries are more than adequate and save you almost 3 ounces, compared to the 12S 4000 mAh packs. I agree that the 12S batteries will probably last longer, since they are not worked as hard as 10S packs. I could not feel any performance improvement with 12S packs.
As stated by other members: 12S packs are legal now in AMA classes, but not yet in FAI.
Another consideration: My Mezon ESC does not automatically recognize the pack cell count. So, if I switch from 10S to 12S, I need to reprogram the ESC 😟.
But, 6S (2x) cells are much more readily available than 5S or 10S packs.
Lots of variables!
Sean

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From: NSRCA-dist8 <nsrca-dist8-bounces at lists.nsrca.org<mailto:nsrca-dist8-bounces at lists.nsrca.org>> on behalf of Karl Watts via NSRCA-dist8 <nsrca-dist8 at lists.nsrca.org<mailto:nsrca-dist8 at lists.nsrca.org>>
Sent: Monday, January 24, 2022 7:25 PM
To: AK, ID, MT, OR, WA, WY <nsrca-dist8 at lists.nsrca.org<mailto:nsrca-dist8 at lists.nsrca.org>>
Subject: [NSRCA-dist8] Batteries

Anyone switching to 12s packs?

Karl

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