New generation Turnigy 60c lipos who's using them?

[bpgoa]

I think we should look at the heat generated in the pack. That's CurrentX current X internal resistance Joules per second or watts. Packs will get a fixed rise in temperature for a fixed amount of energy or joules, less any heat they can loose by cooling. So every time the C rating doubles the internal resistance has to go down by a factor of 4. There will also be less heat lost as there is less time to lose heat. So these packs must have an internal resistance around 1/5 that of 30C packs. A reasonable 30C pack would be around 1.5 milliohms, so these packs must be around 300 micro ohms.

It's just impressive, what HK can produce, or at least what they claim... They are not alone though, I don't think it is possible for any lipo pack to run at even 30C, as there is no way for the heat to get out from inner cells. Of course, they might mean that one cell on its own will work at 30C once without exploding...


Higher C packs will run cooler though and will be ok for 5 minute flights and be able to give high currents for high load situations. I'd like to know the irs of some HK 3S packs and I'm happy to test them. I think I'll stick with GensAce for now. They come with a tested ir value for each cell.

What a fantastic thread for haters. Why are you even contemplating wire thicknesses for continuous discharge levels. Most if not all of us want to run the packs for 5 mins in a Heli so that should be the benchmark.

What's the real win. As above. Hopefully these packs have a significantly lower internal resistance so the I squared r losses should be lower. Which as we all know means cooler batteries,less Voltatage sag and higher head speeds (mmmmm more headspeed)

Ok now back to reality. I've ordered 6 packs of 3300 6 cells to try on the trex 600 pro. Will report back.

[Helimaddan]

Interested in hearing how you get on with these mate so please do post back to this thread when you have some news

[ChrisB]

The point of it.

What does C Rating mean on a Lipo Battery - YouTube

[cjcj1949]

What he says is correct. Unfortunately he fails to mention that there is no way to establish the C rating of any battery and that C rating are nothing more than marketing bollocks. They like haveing something they can sell people that people can't verify. We can measure internal resistance though, and low resistance batteries are much better than higher resistance ones. But, if your flying is so sedate that your battery doesn't get hot, then your battery is ok, whatever readings or spec it is.

[bpgoa]

What he says is correct. Unfortunately he fails to mention that there is no way to establish the C rating of any battery and that C rating are nothing more than marketing bollocks. They like haveing something they can sell people that people can't verify. We can measure internal resistance though, and low resistance batteries are much better than higher resistance ones. But, if your flying is so sedate that your battery doesn't get hot, then your battery is ok, whatever readings or spec it is.

Good point - Well made. And I have to agree whole heartedly.

I know I had great success with the 35-70 jobbies So thought these are worth a punt.

The proof of the pudding is in the eating so I'll report back when I get them.

I have a brand new pair of 35-70 that I haven't started to use yet ( waiting till the others go duff (80 cycles on some.) ) so I'll put them side by side.

[cjcj1949]

I'm not sure about that, it may be more the indigestion. New lipos are usually well though of until they start to puff. All lipos will last a lot longer if not pushed. One day they may be so good that we won't be able to push them. My two year old Tipples are starting to go. Only lasted two years....

If a lipo lasts 50 cycles then the cost is lower than the petrol it takes to go flying. That's without all the other costs due to lack of loctite etc.

[bpgoa]

Ok 6 turned up today. Box was a bit bashed and one of the cells puffed. Will check all in the morning.

[bpgoa]

One of the cells was dead. Sent it back and HK have credited my account.

Used the 65c for the first time last Sunday. As expected of a new battery they were awesome on power delivery and the headspeed didn't budge all the way through the flight.

I ran them for 4.5 mins rather than my normal 5 to ease them into use but at the end of that time, they were at 3.78v per cell. Same as my normal sets after 5 mins. I put this down to the higher headspeed maintained through the flight.

My Heli (600e pro) runs a flat 100% in idle up 2.

Now time will tell if they hold up.

[Delarado]

warm?

[bpgoa]

warm?

Headspeed was higher. Motor was hotter. Batteries were warm but in no way hot. About the same as normal.

[Planehazza]

The packs claim to be 65C, but I doubt that would ever be asked of it from a motor / ESC anyway. Whether the claim is false or not, I can't see where that much current would ever be demanded unless they're using a 2000 size machine or something. Unless I've misunderstood?

[Andy from Sandy]

The packs claim to be 65C, but I doubt that would ever be asked of it from a motor / ESC anyway.

As explained in earlier posts, if the C rating is correct it is as a result of a lower internal resistance. In order for a pack to survive long term it needs a low IR to limit the internal heating effect. As the pack is called upon to supply high currents so the pack gets hot. Heat is very bad. If the pack is warm to the touch the internal cells are much warmer. If the pack is hot the internal cells are almost certainly cooking and will not last for many cycles.

[bpgoa]

As explained in earlier posts, if the C rating is correct it is as a result of a lower internal resistance. In order for a pack to survive long term it needs a low IR to limit the internal heating effect. As the pack is called upon to supply high currents so the pack gets hot. Heat is very bad. If the pack is warm to the touch the internal cells are much warmer. If the pack is hot the internal cells are almost certainly cooking and will not last for many cycles.

Good explanation.

I don't need 65c or 214.5A constant

What I want Is for the internal resistance to not drag the headspeed ( voltage drop)down. Especially under load. And these batteries are awesome for that. At least now in the first few cycles.

Time will tell if they continue to deliver.

[miniadventure]

some of the 3 cell 65-130c packs are turning up at the UK warehouse now at HobbyKing

[cjcj1949]

I'd like to know the internal resistance as measured on a Wayne Giles meter. If anyone is close to Bracknell they can bring them round and 'll test them. An icharger gives similar results but is not accurate enough to prove this cell is 65C. Comparisons need to be carried out at the same temperature. All lipos are very good at the moment, especially on a black surface in the sun. It is over 40 degrees C then.