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That's a lot if wasted money! What do you recommend? I'm waiting for the dura 245 dual charger and 3s 35c 5000mah lipo package...it's on back order. Would you cancel the order! Thanks.Had a pair of Onyx 3S 5400 50C that I bought with my Nero, as it was the spec battery for it at Tower. Big mistake. Both puffed like a circus clown's balloons. Less than 12 cycles, never abused, never charged >1C. Called Duratrax/Hobbico and was told that the warranty ends the first time you charge them. Never again.
That's a lot if wasted money! What do you recommend? I'm waiting for the dura 245 dual charger and 3s 35c 5000mah lipo package...it's on back order. Would you cancel the order! Thanks.
A small reminder about ohms rules P=U.I
The problem you will have it is a Duratrax 245, that it's not powerfull enough to charge your two batteries @ 1C. It can deliver only 40 W per channel and for your's 5 Ah 3s battery you need a minimum of 63 W per channel @1C (4.2v x 3(s) x 5 A)
I'm not sure there is a lot of charger on the market able to handle 100 W per channel (confortable) and probably it will be a better choice to buy 2 charger that works simultaneously. My Ultramat (90 W) can just handle my Hobbystar 3s 7600 mAh that needs 83 w of power @ 1C.
If you want to charge two batteries with one charger, you will need to find a big DC charger like this : http://www.progressiverc.com/icharger-308duo.html but I'd rather buy two 106B @ 89 us$ each. If one failed, I can continue charging with the other one, the time to fix it ;-) (this is an example, i do not work for iCharger)
An other point to verify, it is that often, the manufacturer do not give the maximum power of the charger on AC but when it's pluged in DC.
I think, is you limit your batterie pack to 3s and be sure you'll nerver climb to 4,5,6s, you can do the job with a 90 W-10 A Ac charger like a Ultramat 16s (that do a good job)
This is the minimum. A 80 W (common) is already not enough for my 3s 7600 mAh pack.
And were talking about charging your lipo @ "only" 1C. For 2C rate is the double.
Fortunately, I red on the website of the manufacter Panasonic, that the optimal charging rate to get the maximum of cycle on a Lipo is around 0.7/0.8 C. It is the charging rate they use go give the cycle life of a battery Less than that it is not so good. I gess it's the same rules in other brands.
I leave this open door for the pro of lipo to give me some explanations about that.
For the batteries itself, it's difficult to make recommandations. For my Nero, I want 3s hardcase. I found the Hobbystar 3s 7600 mAh 75c @ around 65 us$ each. They last around 45/50 mn hard driving on the heavy Nero. They fit perfectly on the Nero battery case.
They have plenty of power, but they are TOO NEW (few cycles) to recommand it.
My other pack (gens-ace-r-spam) looks good but same thing. The 2s 6500mAh pack @ 50c last around 30 mn hard driving on the Nero and around 50/60 mn on my buggy Cobra (on track condition, not often full throttle)
Next year I could express you my opinion about these batteries.
Regards.
I really appreciate your help for a new rc guy. I was wondering if there is any pros or cons between 2s1p and 2s2p packs? Same for 3s? Your thoughts? Thanks a lot!There is many site what can give you information about battery. You can begin by here :
- https://rogershobbycenter.com/lipoguide/ it's well explained, simple and enough for rc user.
- http://batteryuniversity.com/learn/ probably one of the most complete site on general battery (not only lipo)
I didn't keep the link to Panasonic, but it's not so much interresting for rc users, it's about satellite inboard lipo etc
With the first link is really enough informations for rc users after it's only if you want to improve your culture.
Enjoy !
and to help you on the choice of your battery remember that :
U=R.I and P=U.I ( P Watt, U volt, I Amp)
If the power of your bushless motor is 2000 W for example, if you run on 4s (3.7 x 4 = 14.8v) it can demand 135 A on your battery. If nobody lies ;-p if you have a lipo 4s 5000 mAh 30C looks good.
5000 mAh x 50c = 150 000 mAh = 150 A
For the same motor and on 6s now (3.7 x 6 = 22.2 v) you 'only' need 2000 W / 22.2v = 90 A.
That means that if you have the same capability battery 5000 mAh (4s and 6s), you can run 2,22mn (2 mn 12s) on 4S and 3,33mn (3mn 18s) on 6S on full load→ 50 % more time.
This not a scoop, your voltage is 50% higher and probably the weight of your 6s battery will be around 50% more. (a little less)
But remember that, for the same motor your C rating decrease if the voltage increase. and your 6s battery need only to be a 6s 5000 mAh @ 20C
5000 mAh x 20c = 100 000 mAh = 100 A (for 90 A power on the same motor)
But as I said, this is true if nobody lies and manufacturer always lies a little (a little ? not sure) and if you find a 30 C lipo by calculation it's certainly better to increase a little the discharge rating to 35C but not to 100C lipo, you'll waste your money for nothing.
Off course i gave this values only for example. You never drew so mutch power for long time. But probably on big 1/8 Monster, the motor power schould be between 2000W/ 3000 W and believe me, this a lot on this low voltage.
Enjoy !
And I want to apologize to the autor of the thread to have a little overflowed the main subject.
I was lucky enough to get one. My 5600 have been on back order for 3 weeksThat's a lot if wasted money! What do you recommend? I'm waiting for the dura 245 dual charger and 3s 35c 5000mah lipo package...it's on back order. Would you cancel the order! Thanks.
Where did u get the 5c charge rate from ???? On the instructions I got with my gens-ace-r-spam it said never charge over 1c
Yes, Arrma states that those are minimum battery specs.Great thread here guys.
Im a noob and was just about to pull the trigger on a kraton and 2 batteries of the exact spec Arrma recommends.
But upon reading the great info here, feeling like I shouldn't follow their spec and should consider their numbers as bare minimums.
Would you all agree?
My goal is to maximize power and runtime.
So with that, should i focus on gettting the highest mah, volt and C as possible?
Also, is there any reason to get a single 6s battery vs 2 @3s?
Thanks in advance.
and to help you on the choice of your battery remember that :
U=R.I and P=U.I ( P Watt, U volt, I Amp)
5000 mAh x 50c = 150 000 mAh = 150 A
.
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