Thunder power lacking power.

[Gary]

Anyone running the Thunder Power 65-130 batteries? I just swaped from 45-90 4,400mah 18.5 to 65-130 5,000mah 18.5 and saw only a 1-mph change after many test runs. Seems strange since they are puting out 200 amps more.............I would think there would be a boost of speed. They still get pulled down to around 18.5 -19 volts at full speed on Data logger. Could batts be all hype?

[Fluid]

You do not understand what the "C" ratings mean. They do not mean that the battery puts out more amps. The values are an indication of the amperage the packs could put out safely if loaded enough by the motor.

If your old batteries were not asked to deliver more than 200 amps you should not see any measurable change in performance with the new packs. Your current amp draw is well below that based on the very low voltage depression you logged. All you would see is an increase in run time. If you want additional performance then you would need to load the packs more - not a good idea since you would need to increase the draw to near or above 200 amps to see much difference. Depending on their quality the motor or ESC would likely fail first. This is assuming that all packs are in good shape.



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[JimClark]

Thread moved from the FS forum

[Gary]

Ooops! Thanks Jim! Jay,I was just assuming that with a higher C- rating and more mah {650} amps max output, that i would see less voltage drop and as a result, an increase in speed. All this time I thought a higher C-rating puts out more power regardless.

[Fluid]

Nope, only if you demand it. At the low amp draws you have, the difference is really small. But at 250 amps you'd see a notable difference in voltage drop in favor of the new packs. Still, there is plenty of drop. At 300 amps my TP 65C packs still drop down to ~3.3 volts. Older 45C packs hit the LVC at 3.0 volts...


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[detox]

I noticed that the Thunder Power packs and the cheaper Nano Tech packs are the same size. I wonder if they come from the same factory?

[Gary]

Ok then how about this. Im trying to get more speed by useing bigger and better battery power and its not happening, so it apears that the amp draw "is what it is" and i need to look elsewhere correct? I just thought that if I could get the voltage drop down to a minimum, its at 18.5 to 19 volts at 93mph full load, then it would go faster. Props dont seem to make much difference.

[detox]

Lipos perform their best after a few cycles. Discharge rate and/or voltage should gradually improve more and more up to a point. The more voltage the faster you go.

[detox]

I have actually witnessed larger heavier batteries slowing the boat down just because of the added weight. Voltage was the same.

[Anbjorn]

I have been using the Hyperion 35-65C with good results. I also have a couple of 6S 5000mAh 45-90C Hyperion packs that I have not tested yet.
For a while now I have been reading up and investigating if there are any better options available.
Obviously the Thunderpower 65-130C packs have been on my mind.
Is there anybody that have really tested the Thunderpower 65-130C packs? And then I mean REALLY tested them close to their limit of what they can deliver?

Basically I am looking for 5S and 6S packs and want to run 10, 11 and 12S in 1P config.
Are the TP7700-5SPP65-7700mAh 5-Cell and TP7700-6SPP65-7700mAh 6-Cell packs really able to deliver close to 1000A burst?
Is this just creative marketing and I should forget about them, and instead get some 5S 5000mAh 65-90C Hyperion packs and be done with it?

Not trying to start a big argument or discussion regarding why, or what setup etc.
Just looking for facts and real experience with the ThunderPower packs.
Thanks
Anbjørn

[Fluid]

Ok then how about this. Im trying to get more speed by useing bigger and better battery power and its not happening, so it apears that the amp draw "is what it is" and i need to look elsewhere correct?

Okay, now I'm confused. You are running 5S (18.5 volts nominal) yet at full draw the voltage drop is only to the 19 volts? You must be pulling relatively low amperage for that speed, under 200 amps. (My TP 65C/5000mAh packs when loaded to 300 amps are down to ~3.4 volts per cell.)

To get more power to the prop for more speed you need to either install more motor or a more efficient prop, or both. A better quality motor, a motor with a higher Kv, or one the same Kv but in a larger size (keeping quality the same) can allow higher speeds. A prop with higher efficiency (less slip) or more pitch can allow for more speed - both avenues will load the packs more and pull out more power. Then you will see some difference in cells....but really, 45C cells (if they are REALLY 45C) are pretty darn good for about any use.

It isn't always just a matter of pouring more money into a boat to get it to go faster.......

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[Gary]

Fluid,I do not know the amp draw. The motor is a 1527.5y, a 240HV and a x647 prop. Boat comes in around 13 lbs and is a Super Sport 45. I read at some point that you had stated on SAW boats you want the rpm as close to the no load rpm as possible for fastest speed. I just assumed that the only way to do that is to have absolute minimal voltage drop to keep rpm up. Am I wrong {yet again}? LOL Also do you know what the average "fast" speeds are for this hull in SAW compitition. I know you have done alot of racing so mabe you have seen these boats running. Thanks for your input.