lipo C rating

[Meniscus]

Someone correct me if I'm wrong, but that would be a 4s2p setup at 9800mah, assuming that the rhino packs you refer to are 2s1p.

[kookie_guy]

do any of you know about running lipo's in parallel and series? i have plenty of rhino 4900 20c. i am looking to run a 8xl with 150 etti. i was thinking if i ran 4 packs, 2 in parallel then in series i would come up with 9800 mah at 14.4 volts. is this a problem to run them that way or is it the same to series them and then go parallel as it would be running 2 9800 mah 4 cell packs. i dont care about the run time, i'm looking for the batteries to put out more amps.
thanks

you are correct, you would get 9800mah, at 14.8volts. I would be affraid of one of the packs getting out of balance or something, and I'm not sure how the stock cutoff would act, since theoretically if one pack blows up, the other would still indicate that it's good. So the packs would all have to discharge equally.

I may be way out to lunch with my way of thinking, but ya.

[Blackjack-sven]

I would be afraid of one of the packs getting out of balance or something, and I'm not sure how the stock cutoff would act, since theoretically if one pack blows up, the other would still indicate that it's good. So the packs would all have to discharge equally.

I may be way out to lunch with my way of thinking, but ya.

If you were to keep the cutoff at lets say 10 volts, then when 1 of the batteries were to blow the voltage would drop instantly, and if it went below the 10v cutoff the boat would suddenly stop temporarily. If you wanted to run 4 packs at once for power and endurance just make sure you have the batteries balanced at all times and make sure they start off all new and of high quality so you'll never need to worry about problems.

[MAXAMUS]

do any of you know about running lipo's in parallel and series? i have plenty of rhino 4900 20c. i am looking to run a 8xl with 150 etti. i was thinking if i ran 4 packs, 2 in parallel then in series i would come up with 9800 mah at 14.4 volts. is this a problem to run them that way or is it the same to series them and then go parallel as it would be running 2 9800 mah 4 cell packs. i dont care about the run time, i'm looking for the batteries to put out more amps.
thanks

I'd just run 2 in series to run 4 packs in any combination of series or parallel etc its going to be a huge weight and CofG issue not to mention as others have said pack over discharge and balancing hmmmm you may even consider selling the packs to go towards the packs you require with a high c rating well that's my 2 cents worth............

[bwells]

blackjack-sven: thats the formula I was thinking of thanks. 2 7.4 4000mah 20c 30c should be fine for stock bj26

[Chuck E Cheese]

i am going to try just 2 but im not sure that 4900mah is enough amp output. i will try it and see if they get hot. if not it is all go but otherwise i need to up the capacity to get 20c to represent a larger number. i think my set up is going to pull right around 80-90amps so it is boarderline.... thanks for the replies. also dont worry, if i do use 4 i will ballance them and they are all brand new. i have a pile of brand new ones. cg not an issue because im set up with 2 forward center and 2 side of the rails. i hace a df 29 with 4" rails and rear motor configuration.

[bwells]

you can change voltage and mah by series or parallel but amp ratings by going series is going to stay the same. what you want to do is make the last battery in the series do more than it was designed to do, the buck would stop there.1st battery 20c going to 2nd battery at 20c which would only deliver 20c, how would it spit out 40c, the amps still have to travel through that last battery before leaving and heading to the esc. you would be asking that last battery to cough up more amps than it was designed for. Electric guys, is this correct, I don't want to steer anyone wrong?

[bwells]

plenty? do you want to sell 2? I was looking at 4000 mah but 4900 sounds good to me

[Blackjack-sven]

I wouldn't mind a set of 4900 lipo's as well seeing as I only have one set to play with right now.

BWELLS your statement seems a bit confusing. in series you would bring the voltage up, and both batteries would stay at 20c without problems. In parallel you would get the mah to double, also without a problem. If Chuck E Cheese wants both doubled for longer run times as well as more power, he would need to go to 2 batteries rated at 9800mah 11.1v and 40c or use 4 of his batteries 2s 2p to get the same, but if he does use 4 batteries, not only will the weight of his boat go up, his cg will certainly get screwed up, causing a fair amount of performance problems.

I'll post some pics up with the 4 batt. setup and the 2 batt. setup to show how the cg will get affected.

Actually the cg won't get affected too badly. It only moves the cg forward by 1 inch.

[bwells]

I'll have to disect your post again but he wants to increase the amp by series and I don't see how that can happen no matter whether he does series or parallel. amps is draw and the last batt, the one with the red wire going to the esc is handle everthing whether it is 2s2p or 2s 1p in series. answer back as I see you are still online

[Chuck E Cheese]

keep in mind bwells, in parallel there are now 2 red wires going to the esc, one from each last pack.
i am pretty sure that running 2 packs in parallel will yeald a higher output because the 20c is based on the pack capacity. it doesn't mater anymore, i went with 2 x 2650 4 cell 30c packs that i am going to run in parallel. i think this should give me 5300 mah @ 159 amp output, i really only need around 100amps. it should work well because i use 4s2p 4000mah total in another boat and they work fine

also i am not interested in selling packs. i run a 2 cell boat and am building my girl a delta 26 to run on 4 cells (2s2p)

[Chuck E Cheese]

i do have a 25c 4500mah 4 cell pack that i would sell. it is brand new with 5.5mm bullets (female on positive, male on negitive). $65 plus shipping.

[kookie_guy]

I'll have to disect your post again but he wants to increase the amp by series and I don't see how that can happen no matter whether he does series or parallel. amps is draw and the last batt, the one with the red wire going to the esc is handle everthing whether it is 2s2p or 2s 1p in series. answer back as I see you are still online

not by series, by parallel. like chuck e cheese said, now you have 2 red wires, so essentially you have 2 supply circuits of 14.8volts (2 packs in series), connected to ONE red wire on the ESC. The ESC can pull power from both circuits, hence doubling the potential amp output.

[kookie_guy]

here, this should make it nice and clear......

[Blackjack-sven]

Answer back as I see you are still online

Sorry I didn't answer you back on the issue yesterday, but I actually fell asleep on my computer. Either way, Kookie_guy answered your question in a very similar manner I would have answered.

BTW: I enjoy it when people dissect my posts as it gives me the chance to defend my knowledge base, and if my knowledge base is wrong I'll be able to see why better.