Question Turnigy BATTERIES

[golem]

Just received a pair of Turnigy 1000mAh 30/40c batts and must say I'm a bit surprised at the rather small gauge power wires. Considering this is a 30-40 amp rated lipo the 18awg seem a bit under-done. Was expecting to retrofit with Deans regulars, sadly it seems overkill. Anyhow, these as yet unused $9 batteries (as pictured) weigh in at 91.5g.

Cheers!

[RC Man]

Why does this page give me a security certificate error?

[Hugh P]

Been using several of the 2200 3S1P 20-30C Turnigy packs in a T-28 and a rebuilt Electra for two months without problems.

Connectors on the packs are OK except for the extremely cheap plastic housing.

I am not pushing these packs hard, just having fun.

Also have 1300 3S1P, 1800 3S1P and 5000 5S1P Turnigy LiPos as well as several speed controllers. NO Problems.

The Turnigy Sentry ESC's monitor cell balance and individual cell voltage for low voltage cut off using the balancing port.

Hugh

[everydayflyer]

That battery has a JST connector on it and like others of similar size was intended for use in a Park flyer with less than 10A load. The JST connector is really only good for around 5 amps. cont. and burst to 10 amps.

A 1000 mAh used at 6 amps. average results in a 10 min. flight which is very common for Parkflyers.

Charles

[golem]

Yeah, that 30/40c rating may be great for holding full voltage but I'm leary of even putting 15 amps through the power leads even with the Deans added. I bought these for a 20a application so I'll have to do some bench testing first, see if I can burn some insulation.

Shame they chose to do this as I've had good experiences in the past with their batteries. Still running some small over 3yo 15c HXT batteries and they continue to provide ample power and mAh. Their 30c Zippy's have been stellar performers for more than a year. Only the 20c Loongmax has been a little lacking, the 25c Loongmax's I have perform very well.

Cheers!

[jsmith285]

Got about 15 charges on them so far. Noticably more powerful than my other batteries.

[tclaridge]

I have some 4S 5000 Turnigy batteries with about 25 cycles. I push them hard, and they barely get warm. Great output. They perform better than my previous V2 Thunder Powers.

[Mike Freas]

This debate will likely never end.

I'm not brand loyal with packs as I am with my other RC stuff so I've tried many. I currently have 4 ValueHobby packs which are identical to the old zippy's from HC. I've had them for a year and pushed them hard. The two 3s 2200's are going strong in my FunJet pulling 38 amps. My 4s 2250's I fly in my T45 EDF are showing thier age and one is puffing now. Still, I paid 45 bucks for them and they lasted a year pulling 20C.

I bought a V3 TP 3s 2200 for 80 bucks and it lasted a year also with no real increase in performance.

I currently have a Hyperion G3 3s 2200 that I fly in the same FJ as the cheep packs. The only advantage I see currently is the ability to charge at more then 1C.

I just ordered a 4s 5000 mah 30C from HC for the T45. Cost me 77 bucks shipped. We will see how she holds up.

[skizziks]

Hobby king will not be using Deans connectors in their new packs because Deans connectors are difficult to find in asia now....

[Himalaya]

Just got 2x 6S 5000mAh 20C, for my FE boat. Fully charged and then got 5280mAh out of it to 3.0V/cell. I never seen this on other big name packs(higher actual capacity than norminal). Ran pretty cool in my boat, far better than my Hyperion VX4500 6S(with Enerland cells), similar to my Hyperion G3 VX4200 6S.

The only point I dislike is it comes with 4mm bullet installed. I have to cut the red shroud open to get the bullet out, desolder them, then solder new Deans. Would be much better to come with just bare leads, like most others do.

[Wayne Giles]

Originally Posted by Himalaya

Ran pretty cool in my boat, far better than my Hyperion VX4500 6S(with Enerland cells), similar to my Hyperion G3 VX4200 6S.

I have just bought the same Turnigy 6S5000 20C and have not flown it or run a test discharge but measured the ESR of the cells at 25Deg cent using a 12mS 10C pulse. Results:-

1.65 milliohms 1.60 - 1.55 - 1.50 - 1.50 - 1.50.

Also measured all cells together - 10.5 milliohms. Difference of individual cells and total is the cell interconnections (1.2 Milliohms)

Measured the resistance of the leads + connectors + 8" of 12AWG wire to ESC input = 6.3 milliohms so on load lead losses are 60% as high as pack losses. I guess they will be greater than pack losses when the pack is warm.

I wonder how much lower a 30C pack is; I find 30C packs struggle more at their max ratings than 20C ones.

Wayne

[pmdevlin]

I recently had two 3 cell turnigy 30c 5000mah batteries from Hobby King. One of the packs arrived with a dead cell. I immediately returned it tracked mail (cost half the price of the pack!) Unfortunately HK are really letting themselves down with very poor customer service. They stated could not locate battery (thankfully I had tracked mail) then said its in a queue to be tested (3 weeks!!!!! ) Constant stalling tactics, I have asked for a paypal refund which to date has been ignored

[kevinb120]

Love the ones I have, push them hard, always much cooler then the same spec rhinos after running in the same birds, all underrated in mah. Silicone main and balance wires(although a bit oversized, my 3 and 4s 2600mah 30cs are friggin 10ga!). Always balance perfect. I switch everything to APP's so could care less about the connector.

Only HK battery I have had doa was a zippy 2250 4S 20c, sent it back(took about 1 1/2 weeks with $7 cheapo shipping), they got it and sent it back 2 days after getting it. They actually sent me a 2250 30C back!

I have 4 2650 30C 3s(wide long packs) and 3 of the 4s, and 4 of the 25C 2200 3S packs. They are all champions.

[Himalaya]

Originally Posted by Wayne Giles

I have just bought the same Turnigy 6S5000 20C and have not flown it or run a test discharge but measured the ESR of the cells at 25Deg cent using a 12mS 10C pulse. Results:-

1.65 milliohms 1.60 - 1.55 - 1.50 - 1.50 - 1.50.

Also measured all cells together - 10.5 milliohms. Difference of individual cells and total is the cell interconnections (1.2 Milliohms)

Measured the resistance of the leads + connectors + 8" of 12AWG wire to ESC input = 6.3 milliohms so on load lead losses are 60% as high as pack losses. I guess they will be greater than pack losses when the pack is warm.

I wonder how much lower a 30C pack is; I find 30C packs struggle more at their max ratings than 20C ones.

Wayne

Look like the cells have much lower pulse IR then static value. I measured with my Hyperion EOS0720i hooked to a PC. In a 3.2A discharge process with 3 second pauses(0A) every minute, I got this graph. From the voltage pulse height we can read the IR=8mV/3.2A = 2.5mΩ. That means with 150A (30C) current it will have only 0.375V/cell voltage drop, not too bad isn't it?

[Wayne Giles]

Himalaya said:-


"Look like the cells have much lower pulse IR then static value. I measured with my Hyperion EOS0720i hooked to a PC. In a 3.2A discharge process with 3 second pauses(0A) every minute, I got this graph. From the voltage pulse height we can read the IR=8mV/3.2A = 2.5mΩ. That means with 150A (30C) current it will have only 0.375V/cell voltage drop, not too bad isn't it? "



Nice to see someone else doing proper analysis!

From other general testing I have previously done in this area,those results all makes sense. I noticed 3-4 years ago that the latest Kokams (which were a significant step-up over the originals) showed ESR varying with current. This was a new effect I had never seen and have never seen referred to by anyone else. At 15deg.cent the ESR was 24% lower at 50A than 10A. The effect was less as temperature increased.
The other factor is temperature itself. I always soak any pack for 24hours in a temp. controlled enclosure at 25deg.cent (77F.) before testing, which is fairly high but a good benchmark. What temperature did you take your readings at??
Looking at the plots below which are all 3S2200 20-C packs you can see how important temperature is and how much the temperature coefficients vary both in value and slope. (sorry its a rubbish file but just about readable)

The 2.5 milliohms is, as you say, pretty impressive with a theoretical drop of 0.25V at 20C and 0.375V at 30C. In fact the actual drop will be a fair bit less because of these two factors above, falling further as the pack warms up.

Wayne